The best time to plant trees, shrubs, and perennials is when the soil is workable and temperatures allow roots to grow, which means spring and fall in most USDA zones. Container-grown plants give you the widest planting window because they arrive with established root systems ready to push into your native soil. If your ground is not frozen and daytime highs stay below 90 degrees Fahrenheit, you can plant with confidence.
Timing matters because roots need warm soil and moderate air temperatures to establish before the stress of summer heat or winter cold arrives. The science is straightforward: root growth happens when soil temperatures stay above 50 degrees Fahrenheit at a 4-inch depth. Plant during that window and you set every tree, shrub, or perennial up for long-term success.
Why Planting Timing Matters for Root Establishment
Roots do not go dormant the same way branches and leaves do. Even after top growth slows in autumn, root tips keep extending as long as the soil stays above 50 degrees Fahrenheit. This is why fall planting works so well in zones 6 through 10: the soil holds warmth from summer while cooler air reduces moisture loss through leaves, creating ideal conditions for below-ground growth.
In spring, the equation flips. The soil warms gradually after winter, and roots have an entire growing season ahead of them before they face another freeze. The key is getting your plant in the ground early enough to build a strong root network before summer heat pushes it into survival mode. For most zones, that means planting 4 to 6 weeks before your region's average last frost date or 4 to 6 weeks after it, depending on the plant.
A simple soil thermometer at 4-inch depth tells you more about planting readiness than any calendar date. When it reads 50 degrees Fahrenheit consistently, your planting window is open.
Best Time to Plant in Spring
Spring planting is ideal in USDA zones 3 through 6 where winters are long and soil stays frozen well into March or April. Once the ground thaws and stays above 50 degrees Fahrenheit, you have a generous window to get plants established before summer heat arrives. In zones 3 and 4, that window typically opens in late April and runs through early June. In zones 5 and 6, March through May is your sweet spot.
Spring is the prime season for deciduous trees like Autumn Blaze Red Maple (Acer x freemanii 'Autumn Blaze'), zones 3-8, maturing to 40-55 ft. tall and 30-40 ft. wide. Getting a maple in the ground by mid-spring gives it a full season to develop feeder roots before its first winter in your landscape.
Evergreens also benefit from spring planting in cold climates. Green Giant Arborvitae (Thuja standishii x plicata 'Green Giant'), zones 5-8, 40-60 ft. tall and 12-18 ft. wide, grows 3-5 ft. per year once established. Spring planting lets it push roots aggressively through summer so it enters winter already anchored.
#ProPlantTip: In zones 3-5, wait until your soil thermometer reads 50 degrees Fahrenheit at 4-inch depth before planting. That reading matters more than the calendar date, and it can vary by 2-3 weeks from year to year.
Best Time to Plant in Fall
Fall is the preferred planting season in zones 7 through 10, and it works well in zones 5 and 6 too. Soil is still warm from summer while air temperatures drop, creating the perfect ratio for root growth without the stress of pushing new leaves and flowers. The golden window is the 6-week period before your area's average first hard freeze.
Flowering shrubs thrive when fall-planted because they channel energy into roots rather than blooms. Browse the Flowering Shrubs collection for container-grown options that establish quickly when planted in September through November.
Limelight Hydrangea (Hydrangea paniculata 'Limelight'), zones 3-8, 6-8 ft. tall and 6-8 ft. wide, is a strong candidate for fall planting. Its roots take off in warm soil, and since panicle hydrangeas bloom on new wood, a fall-planted Limelight has all winter and spring to build the root mass that fuels abundant summer flowers.
Fall-planted shade trees gain a huge head start. Trees like Sugar Maple (Acer saccharum), zones 3-8, 50-75 ft. tall and 35-50 ft. wide, establish extensive root systems through autumn and early winter, then explode with top growth the following spring.
Can You Plant in Summer?
Yes, you can plant in summer if you choose container-grown stock and commit to consistent watering. Container-grown plants have intact root systems already growing in soil, so they transplant with far less shock than field-dug stock. The roots do not need to regenerate from scratch; they simply continue growing outward into your native soil.
Summer planting requires more attention to watering. Water deeply 2-3 times per week for the first 8 weeks, applying enough to soak the root zone to 6-8 inches deep. Mulch 3-4 inches around the base (keeping it 2 inches away from the trunk) to hold moisture and keep soil temperatures cooler.
Heat-tolerant species handle summer planting especially well. Crape Myrtle trees, hardy in zones 6-10 with mature heights from 15 to 30 ft., actually thrive in summer heat. Frost Proof Gardenia (Gardenia jasminoides 'Frost Proof'), zones 7-11, 3-5 ft. tall and 3-4 ft. wide, is another strong performer when summer-planted with adequate irrigation.
#ProPlantTip: If you plant in summer, water in the early morning before 10 AM. This gives roots time to absorb moisture before afternoon heat drives evaporation and reduces the risk of fungal issues from wet foliage overnight.
What Happens If You Plant Too Early or Too Late?
Planting too early, before the soil warms to 50 degrees Fahrenheit, puts roots in cold, wet ground where they cannot grow. The plant sits stagnant, burning through its energy reserves without building new roots. In the worst case, waterlogged frozen soil causes root rot before the plant ever has a chance to establish.
Planting too late in fall creates the opposite problem. If you put a tree in the ground only 2 weeks before a hard freeze, the roots have no time to anchor. The plant goes into winter with a shallow, undeveloped root system that cannot replace the moisture lost through evergreen foliage or support spring growth. For fall planting, aim for at least 6 weeks before your first expected hard freeze.
Planting too late in spring, just before summer heat arrives, forces the plant to establish roots and cope with heat stress simultaneously. In zones 7 and above, late May plantings face 90-plus-degree days within weeks. If you miss the ideal spring window, consider waiting for fall rather than forcing a summer establishment.
The Container-Grown Advantage
Container-grown plants from Nature Hills arrive with fully developed root systems growing in nursery soil. This is a major advantage over field-dug stock because the roots are never cut, never dried out, and never need to regenerate before they can support the plant. You slide the root ball out of the pot, loosen the outer roots, set it in the hole, and the plant keeps growing as if nothing happened.
This intact root system means a wider planting window. While field-dug trees are limited to narrow dormant-season windows, container-grown stock can go in the ground any time the soil is workable and not frozen. Explore the Trees collection and the Shrubs collection for container-grown options that ship ready to plant.
Container-grown Emerald Green Arborvitae (Thuja occidentalis 'Smaragd'), zones 3-8, 12-15 ft. tall and 3-4 ft. wide, is a perfect example. These evergreens ship with dense, healthy root systems that transplant reliably whether you plant in April or October. Space them 3-4 ft. apart for a tight privacy hedge.
Best Trees and Shrubs for Spring Planting
Flowering trees are spring planting favorites because they need a full growing season to establish before producing their first blooms. Flowering Dogwood trees (Cornus florida), zones 5-9, 15-30 ft. tall and 15-30 ft. wide, perform best when spring-planted in zones 5-7 where they benefit from warm soil and consistent spring rain.
Bloodgood Japanese Maple (Acer palmatum 'Bloodgood'), zones 5-8, 15-20 ft. tall and 15-20 ft. wide, should be spring-planted to give its delicate root system maximum time to establish before winter. This slow-to-moderate grower rewards patience with deep burgundy foliage through summer and brilliant crimson fall color.
Perennials planted in spring have the advantage of a full season of root development. Most perennials establish faster than woody plants, with many reaching full size by their second spring. Get them in the ground as soon as your soil is workable for the best first-year performance.
Best Trees and Shrubs for Fall Planting
Evergreen trees are outstanding fall planting candidates. Their roots grow actively through autumn as long as soil temperatures hold above 50 degrees Fahrenheit, and the reduced evaporation from cooler air means less transplant stress. By the time spring arrives, a fall-planted evergreen has a 4-to-6-month head start over one planted in April.
Oak trees strongly prefer fall planting. Species like Red Oak and White Oak, zones 3-9, 50-80 ft. tall and 40-60 ft. wide, develop extensive tap roots that benefit from the warm fall soil. University extension research shows fall-planted oaks establish root systems 60% larger than spring-planted oaks by the end of the first full growing season.
Holly shrubs, including evergreen varieties hardy in zones 5-9, are excellent fall-planted screening plants. Their broadleaf evergreen foliage stays dense year-round, and fall planting gives them a solid root foundation before the demands of winter.
Soil Temperature: The Real Planting Calendar
Forget calendar dates. Soil temperature is the single most reliable indicator of when to plant. Roots grow when soil is above 50 degrees Fahrenheit. Peak root growth happens between 60 and 75 degrees Fahrenheit. Above 85 degrees Fahrenheit, root growth slows significantly.
A basic soil thermometer costs under $10 and gives you precise timing for your specific yard. Push it 4 inches into the soil in the planting area and check it in the morning for the most accurate reading. When you see consistent readings above 50 degrees Fahrenheit for 3 or more consecutive days, your planting window is open.
For a detailed breakdown of planting windows by USDA zone, see our guide to When to Plant Trees and Shrubs by Zone, which covers prime spring and fall windows for zones 3 through 10.
| Soil Temperature | Root Activity | Planting Action |
|---|---|---|
| Below 40F | Dormant | Do not plant. Ground likely frozen or near-frozen. |
| 40-50F | Minimal | Possible for cold-hardy species in zones 3-5, but not ideal. |
| 50-60F | Active growth | Good planting conditions. Spring and late fall window. |
| 60-75F | Peak growth | Ideal planting conditions. Strongest root establishment. |
| 75-85F | Slowing | Plant with extra watering. Mulch heavily. |
| Above 85F | Stressed | Avoid planting if possible. Wait for fall. |
Ready to Plant?
The best time to plant is when your soil says it is ready, and container-grown plants from Nature Hills give you the flexibility to plant across the widest possible window. Spring, fall, or even summer with proper care, your new trees and shrubs will establish strong roots and reward you with years of growth.
Browse the full Trees and Shrubs collections to find container-grown plants shipped at the right time for your zone. Every order ships when conditions in your area are safe for planting, so when the box arrives on your doorstep, you know it is go time.
