When to Plant Trees: Best Time of Year (Spring vs Fall Guide)

March 1, 2025
arborist in red hard hat with face shield smiling outside near trees.

Written By: Eric Ledford



ISA Certified Arborist – PN-9290A 

ISA Qualified Tree Risk Assessor (TRAQ)


Quick Answer:
The best time to plant trees is usually early fall or early spring. Fall planting allows roots to establish before winter dormancy, while spring planting works well in cooler climates where soils stay moist. In the Pacific Northwest, March through April and September through October are typically ideal planting windows.
planting young tree

Expert Tree Planting Advice from ISA Certified Arborist

This guide was written by ISA Certified Arborist Eric Ledford (PN-9290A) with experience planting and caring for trees throughout Seattle and the greater Puget Sound region. ISA Certified Arborists are trained in proper planting techniques, tree biology, and long-term tree health. Proper planting depth, soil preparation, and species selection can determine whether a tree thrives for decades or struggles to survive. Following arborist-approved planting practices ensures strong root development, stability, and healthy growth over time.

Written By
Eric Ledford, ISA Certified Arborist and TRAQ Qualified Tree Risk Assessor

Eric Ledford

Founder, Sound Tree Care LLC

ISA Certified Arborist (PN-9290A) • TRAQ • NUCA Dig Safe

Eric reviewed this page for accuracy and alignment with ISA best practices, ANSI A300 standards, and Seattle municipal tree care and permitting considerations.

👉 View Arborist Profile

Best Time to Plant Trees (Spring vs Fall)

In the Pacific Northwest, the best time to plant trees is typically early spring or early fall. Cool temperatures and consistent rainfall help young trees establish roots without heat stress.


  • Spring planting usually works best from March through April, when soil moisture is high and temperatures remain mild.
  • Fall planting is also excellent in the Puget Sound region because roots can grow throughout the cool, wet winter months before summer arrives.
  • Avoid planting during extreme summer heat or when the soil is frozen during winter cold snaps.

🍂 Fall

Fall is often considered the best time to plant trees. Cooler air temperatures reduce stress, while warm soil allows roots to establish before winter dormancy.

Pros: Strong root growth, less watering needed.
Cons: Limited planting window before hard freezes.

🌱 Spring

Spring is a popular and effective time to plant, especially in cooler, wetter regions. Moist soils and mild temperatures help trees establish before summer heat arrives.

Pros: Good establishment, wide plant availability.
Cons: Requires consistent watering as temperatures rise.

☀️ Summer

You can plant trees in summer, but it comes with higher risk. Heat stress and rapid moisture loss make proper irrigation critical.

Pros: Immediate landscape impact.
Cons: High water needs, greater failure risk.

❄️ Winter

Winter planting is possible in mild climates when the ground isn’t frozen. Dormant trees can be planted successfully under the right conditions.

Pros: Less transplant shock, easier scheduling.
Cons: Limited to suitable weather and soil conditions.

When to Plant Trees in Washington

Washington’s mild climate makes both early spring and early fall excellent times to plant trees. In western Washington and the Puget Sound region, spring planting typically begins in March and April, when soils are moist and temperatures are cool enough to reduce transplant stress.

Fall planting is also very effective in Washington. Trees planted in September through October can establish roots during the region’s cool, wet winter months before summer heat arrives.

Avoid planting during summer drought periods or when winter soil is frozen. Choosing the right planting window helps trees establish faster and improves long-term health.

How Deep Should You Plant a Tree?

Important: Planting too deep and “mulch volcanoes” (mounding mulch against the trunk) are two of the most common reasons newly planted trees fail. The third is inconsistent watering. Getting planting depth right—and keeping mulch off the trunk—dramatically improves survival.

⬇️ Too Deep

Planting too deep buries the root flare and reduces oxygen to roots. Over time, it can lead to trunk rot, poor growth, and decline.

Common signs: No trunk flare visible at soil level, soil or mulch touching bark, settling after planting.

Fix: Re-set the tree higher so the root flare sits at or slightly above finished grade.

✅ Just Right

The root flare(where the trunk widens into roots) should be at or slightly above the surrounding soil. The hole should be 2–3× wider than the root ball, but not deeper than the root ball height.

Mulch: 2–4 inches deep in a wide ring—kept several inches away from the trunk.

⬆️ Too Shallow

Planting too shallow can expose roots and cause the root ball to dry out quickly. The tree may rock in wind and struggle to establish.

Common signs: Visible roots at the surface, exposed root ball edges, tree dries out fast even with watering.

Fix: Add soil around (not over the trunk) and mulch outward to protect roots while keeping the flare visible.

Most newly planted trees should be set so the root flare is at or slightly above grade; planting too deep is a leading cause of tree failure.

Quick Planting Depth Checklist

  • Root flare visible: Trunk widens at the soil line (not buried).
  • No mulch on bark: Avoid mulch volcanoes—keep mulch several inches off the trunk.
  • Water like it matters: Deep watering during establishment is essential, especially in dry spells.

Why Spring is Perfect for Planting

Spring planting allows trees to establish roots during cool, moist conditions before summer heat arrives. In regions with reliable spring rainfall, this often leads to stronger early growth and higher survival rates—especially when planting depth and watering are handled correctly.


Choosing the Right Native Trees

Choosing native trees increases planting success by matching species to local soils, rainfall patterns, and wildlife needs.

Evergreens

  • Western Red Cedar (Thuja plicata): A towering conifer with fragrant foliage, ideal for moist soils.
  • Western Hemlock (Tsuga heterophylla): The state tree of Washington, known for its graceful, drooping branches.
  • Sitka Spruce (Picea sitchensis): Thrives in coastal areas, boasting strong wood and striking appearance.
  • Mountain Hemlock (Tsuga mertensiana): A slow-growing evergreen suited for cooler, higher elevations.
  • Ponderosa Pine (Pinus ponderosa): With its signature long needles and orange-brown bark, it flourishes in well-drained soils.
  • Lodgepole Pine (Pinus contorta): Hardy and adaptable, this tree thrives in diverse conditions, from lowlands to mountains.
  • Pacific Yew (Taxus brevifolia): A slow-growing evergreen prized for its beautiful wood and shade tolerance.
  • Pacific Madrone (Arbutus menziesii): Known for its smooth, reddish bark and evergreen leaves, this tree thrives in well-drained soils.

Deciduous Trees

  • Bigleaf Maple (Acer macrophyllum): A shade-providing giant with large, vibrant leaves.
  • Vine Maple (Acer circinatum): A small, multi-stemmed tree with vivid fall colors, perfect for adding charm to smaller spaces.
  • Pacific Dogwood (Cornus nuttallii): A stunning tree with large white bracts and vibrant berries that attract birds.

Preparing Your Planting Site

  • Assess the site: Check sunlight, soil type, and available space at maturity.
  • Test drainage: Ensure water drains within 24 hours.
  • Clear competition: Remove grass and weeds to reduce moisture loss.

Tree Planting Steps

  • Dig the hole: Make it 2–3× wider than the root ball, but no deeper than its height.
  • Prepare the roots: Loosen circling or matted roots to encourage outward growth.
  • Set planting depth: Place the tree so the root flare sits at or slightly above finished grade.
  • Backfill: Use native soil—avoid heavy amendments that can discourage root spread.
  • Water thoroughly: Saturate the soil immediately after planting to eliminate air pockets.
  • Mulch correctly: Apply 2–4 inches of mulch, keeping it several inches away from the trunk.

Aftercare Tips

  • Water Regularly: Especially during dry periods, keep the soil evenly moist.
  • Protect the Tree: Use guards to shield young trees from wildlife or mechanical damage.
  • Monitor Growth: Remove weeds and check for pests or diseases.


Benefits of Native Trees

Planting native trees is a gift to your local ecosystem. They support biodiversity, provide natural habitat, improve air and water quality, and adapt seamlessly to the climate.


Local Resources in the Pacific Northwest 🌲

  • King Conservation District: Offers a wide range of native trees and shrubs.
  • WNPS Home: A fantastic resource for learning more about native species.
  • Local Nurseries: Many offer expert advice and native plant selections.
Featured on Redfin graphic

Check out the recent Redfin article we were featured in:


In this Redfin article, we’re breaking down how to plant a tree the right way—whether you’re adding curb appeal to your home in Boise, ID or enhancing your backyard in Charlotte, NC. Tree planting isn’t just about digging a hole—it’s about setting roots for long-term success. Follow this detailed, expert-backed guide to give your tree the best start possible. 


How to Plant a Tree That Thrives, Even If You Don’t Have a Green Thumb | Redfin (Parent company of ApartmentGuide and Rent.)
Quick Answer:
The best time to plant trees is usually early fall or early spring. Fall planting allows roots to establish before winter dormancy, while spring planting works well in cooler climates where soils stay moist. In the Pacific Northwest, March through April and September through October are typically ideal planting windows.
planting young tree

Best Time to Plant Trees (Spring vs Fall)

In the Pacific Northwest, the best time to plant trees is typically early spring or early fall. Cool temperatures and consistent rainfall help young trees establish roots without heat stress.


  • Spring planting usually works best from March through April, when soil moisture is high and temperatures remain mild.
  • Fall planting is also excellent in the Puget Sound region because roots can grow throughout the cool, wet winter months before summer arrives.
  • Avoid planting during extreme summer heat or when the soil is frozen during winter cold snaps.

🍂 Fall

Fall is often considered the best time to plant trees. Cooler air temperatures reduce stress, while warm soil allows roots to establish before winter dormancy.

Pros: Strong root growth, less watering needed.
Cons: Limited planting window before hard freezes.

🌱 Spring

Spring is a popular and effective time to plant, especially in cooler, wetter regions. Moist soils and mild temperatures help trees establish before summer heat arrives.

Pros: Good establishment, wide plant availability.
Cons: Requires consistent watering as temperatures rise.

☀️ Summer

You can plant trees in summer, but it comes with higher risk. Heat stress and rapid moisture loss make proper irrigation critical.

Pros: Immediate landscape impact.
Cons: High water needs, greater failure risk.

❄️ Winter

Winter planting is possible in mild climates when the ground isn’t frozen. Dormant trees can be planted successfully under the right conditions.

Pros: Less transplant shock, easier scheduling.
Cons: Limited to suitable weather and soil conditions.

When to Plant Trees in Washington

Washington’s mild climate makes both early spring and early fall excellent times to plant trees. In western Washington and the Puget Sound region, spring planting typically begins in March and April, when soils are moist and temperatures are cool enough to reduce transplant stress.

Fall planting is also very effective in Washington. Trees planted in September through October can establish roots during the region’s cool, wet winter months before summer heat arrives.

Avoid planting during summer drought periods or when winter soil is frozen. Choosing the right planting window helps trees establish faster and improves long-term health.

How Deep Should You Plant a Tree?

Important: Planting too deep and “mulch volcanoes” (mounding mulch against the trunk) are two of the most common reasons newly planted trees fail. The third is inconsistent watering. Getting planting depth right—and keeping mulch off the trunk—dramatically improves survival.

⬇️ Too Deep

Planting too deep buries the root flare and reduces oxygen to roots. Over time, it can lead to trunk rot, poor growth, and decline.

Common signs: No trunk flare visible at soil level, soil or mulch touching bark, settling after planting.

Fix: Re-set the tree higher so the root flare sits at or slightly above finished grade.

✅ Just Right

The root flare(where the trunk widens into roots) should be at or slightly above the surrounding soil. The hole should be 2–3× wider than the root ball, but not deeper than the root ball height.

Mulch: 2–4 inches deep in a wide ring—kept several inches away from the trunk.

⬆️ Too Shallow

Planting too shallow can expose roots and cause the root ball to dry out quickly. The tree may rock in wind and struggle to establish.

Common signs: Visible roots at the surface, exposed root ball edges, tree dries out fast even with watering.

Fix: Add soil around (not over the trunk) and mulch outward to protect roots while keeping the flare visible.

Most newly planted trees should be set so the root flare is at or slightly above grade; planting too deep is a leading cause of tree failure.

Quick Planting Depth Checklist

  • Root flare visible: Trunk widens at the soil line (not buried).
  • No mulch on bark: Avoid mulch volcanoes—keep mulch several inches off the trunk.
  • Water like it matters: Deep watering during establishment is essential, especially in dry spells.

Why Spring is Perfect for Planting

Spring planting allows trees to establish roots during cool, moist conditions before summer heat arrives. In regions with reliable spring rainfall, this often leads to stronger early growth and higher survival rates—especially when planting depth and watering are handled correctly.


Choosing the Right Native Trees

Choosing native trees increases planting success by matching species to local soils, rainfall patterns, and wildlife needs.

Evergreens

  • Western Red Cedar (Thuja plicata): A towering conifer with fragrant foliage, ideal for moist soils.
  • Western Hemlock (Tsuga heterophylla): The state tree of Washington, known for its graceful, drooping branches.
  • Sitka Spruce (Picea sitchensis): Thrives in coastal areas, boasting strong wood and striking appearance.
  • Mountain Hemlock (Tsuga mertensiana): A slow-growing evergreen suited for cooler, higher elevations.
  • Ponderosa Pine (Pinus ponderosa): With its signature long needles and orange-brown bark, it flourishes in well-drained soils.
  • Lodgepole Pine (Pinus contorta): Hardy and adaptable, this tree thrives in diverse conditions, from lowlands to mountains.
  • Pacific Yew (Taxus brevifolia): A slow-growing evergreen prized for its beautiful wood and shade tolerance.
  • Pacific Madrone (Arbutus menziesii): Known for its smooth, reddish bark and evergreen leaves, this tree thrives in well-drained soils.

Deciduous Trees

  • Bigleaf Maple (Acer macrophyllum): A shade-providing giant with large, vibrant leaves.
  • Vine Maple (Acer circinatum): A small, multi-stemmed tree with vivid fall colors, perfect for adding charm to smaller spaces.
  • Pacific Dogwood (Cornus nuttallii): A stunning tree with large white bracts and vibrant berries that attract birds.

Preparing Your Planting Site

  • Assess the site: Check sunlight, soil type, and available space at maturity.
  • Test drainage: Ensure water drains within 24 hours.
  • Clear competition: Remove grass and weeds to reduce moisture loss.

Tree Planting Steps

  • Dig the hole: Make it 2–3× wider than the root ball, but no deeper than its height.
  • Prepare the roots: Loosen circling or matted roots to encourage outward growth.
  • Set planting depth: Place the tree so the root flare sits at or slightly above finished grade.
  • Backfill: Use native soil—avoid heavy amendments that can discourage root spread.
  • Water thoroughly: Saturate the soil immediately after planting to eliminate air pockets.
  • Mulch correctly: Apply 2–4 inches of mulch, keeping it several inches away from the trunk.

Aftercare Tips

  • Water Regularly: Especially during dry periods, keep the soil evenly moist.
  • Protect the Tree: Use guards to shield young trees from wildlife or mechanical damage.
  • Monitor Growth: Remove weeds and check for pests or diseases.


Benefits of Native Trees

Planting native trees is a gift to your local ecosystem. They support biodiversity, provide natural habitat, improve air and water quality, and adapt seamlessly to the climate.


Local Resources in the Pacific Northwest 🌲

  • King Conservation District: Offers a wide range of native trees and shrubs.
  • WNPS Home: A fantastic resource for learning more about native species.
  • Local Nurseries: Many offer expert advice and native plant selections.
Featured on Redfin graphic

Check out the recent Redfin article we were featured in:


In this Redfin article, we’re breaking down how to plant a tree the right way—whether you’re adding curb appeal to your home in Boise, ID or enhancing your backyard in Charlotte, NC. Tree planting isn’t just about digging a hole—it’s about setting roots for long-term success. Follow this detailed, expert-backed guide to give your tree the best start possible. 


How to Plant a Tree That Thrives, Even If You Don’t Have a Green Thumb | Redfin (Parent company of ApartmentGuide and Rent.)

💬 FAQ: When to Plant Trees

This FAQ answers the most common questions homeowners ask about when to plant trees and the best time to plant trees throughout the year. Use it to compare spring vs. fall planting, understand the best time of year to plant trees in different conditions, and avoid common mistakes that can reduce survival rates. If you’re wondering about the best time to plant a tree, this section will help you choose the right season and timing based on weather, soil moisture, and the type of tree you’re planting.

  • Is March a good time to plant trees?

    Yes—March is often a great time to plant in cooler, wetter climates. In the Pacific Northwest, March through April is commonly ideal.

  • Is fall a good time to plant trees?

    Yes—fall is often the best season because roots can establish before summer heat, especially when watering is consistent.

  • Is it too late to plant trees in spring?

    It depends on weather. Once hot, dry conditions arrive, planting becomes riskier unless you can irrigate consistently.

  • What month is best to plant trees?

    The best month to plant trees depends on climate, but early spring and early fall are typically ideal. In the Pacific Northwest, March, April, September, and October often provide the best soil moisture and mild temperatures for root establishment.

  • Can you plant trees in summer?

    Trees can be planted in summer, but it requires more watering and care. Heat and dry soil can stress young trees, making root establishment more difficult. If planting in summer, consistent deep watering and mulch are essential.

Homeowners often ask about other aspects of tree care. You may also find these guides helpful:

Related Tree Care Resources

Where to Get Free Trees in Seattle & the Puget Sound Region

Once you know the best time to plant trees, the next step is finding the right trees. 

Several cities and nonprofits in the Puget Sound region offer free or subsidized trees 

to residents as part of urban canopy and climate resilience programs.

🌿 Seattle Residents

Get free yard trees, planting support, care resources, and more from the City of Seattle’s flagship tree giveaway program. Applicants can receive trees delivered to their property and support to plant and care for them.

 🌳Nearby Cities Free Tree Programs

Bellevue offers free trees for residents and community organizations as part of its urban canopy initiative, in partnership with 300 Trees and other sponsors. Participation often includes training on proper planting and care.

Tacoma’s Urban Forestry Grit City Trees program offers free street trees (and supporting materials) to eligible residents for right-of-way planting. It’s an annual program with applications typically opening in mid-summer and planting in fall.

Shoreline’s Communi-trees program provides one free tree per property, help selecting tree species, and planting supplies for eligible residents.

The Burien Tree Giveaway is offered through the Green Burien Partnership and King Conservation District. In recent years, residents have been able to pick up free trees in fall to plant on private property with landowner permission.

 Regional & Nonprofit Tree Programs

  • 300 Trees (King County) – 300 Trees is a nonprofit running large annual tree giveaway events across King County. Residents, schools, and organizations can select trees (often up to 3 per household) and pick them up at scheduled distribution sites.
  • Tacoma Tree Foundation – The Tacoma Tree Foundation works with local partners and neighborhood volunteers to distribute free or low-cost trees and organize planting events to grow Tacoma’s urban canopy.

💳 Tree Voucher Programs

  • Lynnwood Tree Voucher Program – Lynnwood residents can apply for up to $500 in tree vouchers each year — a coupon you use at participating nurseries to select and plant your own trees at no direct tree cost (aside from planting). 

📅 Most of these programs run seasonally (typically spring or fall) and may require advance registration; check the links above for current availability.


Need help choosing the right tree, planting correctly, or managing long-term growth near structures or utilities? Our ISA-Certified Arborists can help.

🌱 Ready for Expert Tree Planting & Arborist Guidance?


Planting a tree the right way sets it up for decades of healthy growth. Whether you need help selecting the right species, planting native trees, or ensuring proper spacing and soil conditions, Sound Tree Care LLC is here to help.  Our ISA Certified Arborists provide expert, code-compliant tree planting and consulting throughout the Puget Sound region.


Why Homeowners Trust Sound Tree Care

  • 🌳 Proper planting for long-term tree health
  • 📍 Native tree selection for Pacific Northwest conditions
  • 🛠️ Professional installation & aftercare guidance
  • 🧾 Permit and code guidance when required
  • ⭐ 5-Star Rated on Google, Yelp & Facebook
  • 🎖️ ISA Certified Arborists, TRAQ-Qualified


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