Yes, you can plant arborvitae in winter only if the ground is workable, but spring or fall is far safer for root establishment and long-term health.
Winter planting of arborvitae usually means trading a little time against a lot of risk. The tree is dormant when the soil is cold, but its roots aren’t growing, which makes it much harder for it to settle in before the worst weather hits. That doesn’t mean it’s impossible—it just means you need to get the conditions right and accept that the odds of losing the tree go up. Most horticulturists point to early spring or early fall as the clear first choice; winter is the backup plan for the site that absolutely can’t wait.
Why Winter Planting Carries Real Risk for Arborvitae
A tree that goes into winter soil without an established root system faces three stacked problems. First, cold soil slows or stops root growth entirely, so it can’t take up water the way a spring-planted tree would. Second, arborvitae are prone to winter desiccation—the needles lose moisture to dry wind and sun, but the frozen roots can’t replace it. Third, snow and ice can break young branches that haven’t yet built structural strength. Newly planted trees in exposed sites are the most vulnerable. The risk is lowest where winter soil stays workable and prolonged deep freezes are rare; in zones 4 and colder, waiting for spring is the safer bet.
That said, arborvitae are hardy in USDA zones 3 through 7, and many gardeners in milder zones have planted them through early winter without loss. The key is the condition of the soil—not the calendar.
The One Condition That Makes Winter Plantable Soil
Winter planting works only when the soil is workable: loose enough to dig a hole without a pickaxe, and not waterlogged. Frozen ground won’t let roots spread, and saturated clay soil can rot the root ball before it has a chance to grow. If you can sink a shovel and turn soil without force, and the hole doesn’t fill with water, you can plant. If you have to chip at the ground, wait for a thaw or hold off until spring.
How to Plant Arborvitae in Winter the Right Way
If the soil passes the workable test, the planting steps are the same as any other season, but the margin for error is smaller. Choose a site with full sun to partial shade and well-drained soil. Dig a hole two to three times as wide as the root ball and exactly as deep—the top of the root ball should sit at or slightly above ground level, never below. Setting the root flare too deep is the most common mistake across all seasons and kills more trees than cold does.
Water thoroughly immediately after planting, even if the soil feels damp. Newly planted arborvitae need consistent moisture through their first year, and a dry winter can damage them even while they’re dormant. Spread a 2-to-4-inch layer of mulch around the base—bark chips or shredded hardwood work well—but keep it a few inches away from the trunk. Mulch against the bark traps moisture and invites rot or disease.
Table: Winter Planting Conditions by Soil Type
| Soil Condition | Safe to Plant? | What To Watch For |
|---|---|---|
| Frozen solid | No | Roots cannot spread; wait for thaw or spring |
| Thawed but muddy / saturated | No | Root rot risk; wait for soil to drain |
| Workable and well-drained | Yes | Proceed with standard planting, then protect |
| Workable but heavy clay | Caution | Improve drainage; avoid overwatering |
| Frozen only on the surface | Caution | Check deeper; surface thaw isn’t enough |
| Thawed and dry (rare in winter) | Yes | Ideal winter planting conditions if rare |
| Waterlogged after rain/thaw | No | Wait a week for drainage |
Winter Care After Planting—What Changes
Once the tree is in the ground, the care routine shifts. Water the tree about one inch per week until the ground freezes. Dry fall and early-winter conditions are a major contributor to winter damage; a tree that goes into deep cold with dry roots is already stressed. Switch to ground-level watering rather than overhead sprinklers to keep fungal spores from splashing onto low limbs. Stop watering entirely once the soil freezes hard—the tree can’t use the water, and ice around the crown can do damage.
Protection from wind and sun is the second big job. In exposed sites, wrap the tree in burlap or set up a windbreak screen on the prevailing-wind side. Burlap wraps also reduce sunscald on young bark. NYBG’s arborvitae care guide recommends this especially for narrow or columnar cultivars that catch the wind like a sail. In snowy regions, tie the upper branches loosely with soft twine to keep heavy snow from splitting the trunk. Do not prune in winter; the best window for trimming is late winter to early spring, when the tree is still dormant but the worst cold has passed.
Table: Winter vs. Spring/Fall Planting Comparison
| Factor | Winter Planting | Spring or Fall Planting |
|---|---|---|
| Root establishment before stress | Minimal; roots are dormant | Weeks to months of active growth |
| Risk of desiccation | High; frozen roots can’t replace lost moisture | Low to moderate |
| Risk of snow/ice breakage | Moderate to high for young trees | Lower (tree has settled in) |
| Need for wind/sun protection | Critical for exposed sites | Helpful but not always required |
| Watering routine | Can be tricky; stop once ground freezes | Straightforward; consistent moisture |
| Best soil condition | Thawed, well-drained, not saturated | Broadly works across most well-drained types |
| Overall success rate for new trees | Lower in cold/windy climates | High |
Common Mistakes to Skip When Planting Late
The mistakes that kill winter-planted arborvitae are usually the same ones that kill spring-planted ones, but the penalty is harsher. Burying the root ball too deep is the fastest way to rot a tree in any season—keep the top of the root ball a finger’s width above grade. Piling mulch against the trunk is the second. Overwatering in heavy clay is the third; clay holds moisture long after the surface looks dry, and a waterlogged root ball in cold soil is a recipe for root rot. Finally, don’t skip the burlap screen just because the tree looks small—a young arborvitae in an open yard can lose more moisture to winter wind than it would to a summer drought.
When Winter Planting Makes Sense Anyway
A few situations justify the risk. You may have bought trees on clearance in late fall and need to get them in the ground before spring dormancy breaks. A landscaping project may demand early-winter completion before the ground freezes solid. In USDA zones 7 and 8, where deep freezes are short or absent, winter planting carries far less risk than in zones 4 through 6—the soil stays workable longer, and the roots have more time to knit in before summer stress. In those warmer climates, planting in December or January is often routine. In colder zones, it’s a gamble worth taking only when the alternative is losing the tree in its pot.
Final Decision Checklist for Winter Arborvitae Planting
- Soil must be thawed and workable—not frozen, not waterlogged.
- Plant at the same depth as the root ball, never deeper.
- Water one inch per week until the ground freezes solid.
- Apply 2–4 inches of mulch, keeping it clear of the trunk.
- Wrap exposed trees in burlap or install a windbreak.
- Tie up young stems loosely if heavy snow is likely.
- Skip pruning until late winter or early spring.
References & Sources
- NYBG. “Arborvitae Care Guide.” Comprehensive care and planting guidance covering winter planting, watering, and protection.