The Rochester Tree and Shrub Care Calendar: What to Do Each Month

By Margaret Ellison, Tree & Shrub Health. Last updated: July 22, 2026

Timing is most of tree care. The same task that saves a tree in one month can stress or wound it in another, and the right window in Rochester is set by local frost dates, lake-effect snow, and road-salt season, not by a generic national calendar. This is the hub for our seasonal guides: a single, month-by-month reference for what to do and when on Monroe County trees and shrubs, with links to the deeper how-to articles for each task.

What tree and shrub care should you do each month in Rochester?

Match each task to the season. In Rochester (USDA zone 5b-6a), prune most shade trees in late winter, plant and assess winter damage in spring, water deeply and scout for pests through summer, and deep-water plus protect bark and evergreens in fall before the ground freezes. Deep winter is mostly for snow-load response and planning. The table below maps the full year at a glance.

Every row below has a full section, and most tasks link to a dedicated local guide.

What tree care belongs in late winter (February to March)?

Late winter is the core pruning window for most deciduous shade trees. While a tree is dormant and leafless, its structure is easy to read, wounds close cleanly as growth resumes, and disease and insect pressure sits at its lowest. Cornell's horticulture staff point to March as a prime pruning month in Upstate New York, before sap flow and bud break begin.

This is the season to make structural cuts, remove dead or crossing limbs, and plan the year. A few late-winter priorities:

• Dormant pruning of shade trees. Most maples, lindens, honeylocusts, and similar species are best pruned now. Our guide to the best time to prune trees in Upstate NY covers which species break the rule.
• Dormant oil before bud break. A horticultural oil applied on a mild, dry late-winter day smothers overwintering scale, mites, and aphid eggs before they hatch, with less risk to beneficial insects than a growing-season spray.
• Spongy moth egg masses. Scrape and destroy the tan, felt-like egg masses you find on trunks and bark now, before they hatch in spring. See our field notes on spongy moth in Upstate NY.
• Salt and rodent protection. Check trunk guards on young trees, since road salt spray burns buds and bark, and mice and rabbits gnaw thin bark under the snow line.

Oaks are the one species to handle carefully. Late-winter dormancy is actually the safest time to prune them, because Cornell Cooperative Extension of Monroe County advises against pruning oaks from April 15 to July 15, the stretch when the sap beetles that spread oak wilt are most active.

What should you tackle in spring (April to May)?

Spring is for assessment, planting, and the first feeding. Once the snow melts, walk the property for winter damage: broken limbs, salt burn, split bark, and rodent gnawing near the base. As the soil thaws and becomes workable, spring is the second-best planting window, and leaf-out is the traditional moment to fertilize young or stressed trees, but only when they truly need it.

Work the season in this order:

• Damage walk first. Note anything that needs a cut or a closer look before the canopy leafs out and hides it.
• Fertilize at leaf-out, if warranted. Feed only when a soil test or visible decline shows a real deficiency. A healthy, established tree in decent soil rarely needs it.
• Mulch, correctly. Refresh mulch to 2 to 3 inches over the root zone and pull it back from the trunk. Never build a mulch volcano against the bark, which invites rot and girdling roots.
• Scout early. Look for scale, aphids, and the first signs of foliar disease as new growth expands.
• Prune spring bloomers after they flower. Lilac, forsythia, and other early bloomers set buds the previous year, so cutting them now removes the show.

Hold tender planting until the frost risk passes. Rochester's average last spring frost lands in early-to-mid May, so mid-May is the practical green light for anything cold-sensitive.

What tree and shrub care matters in summer (June to August)?

Summer is watering and watching season, not pruning season. Established trees usually manage, but new plantings need deep, roughly weekly soakings through dry spells, and heat turns heavy pruning into a stressor rather than a help. Use the warm months to scout for the pests and diseases that surface now, from borers to mites to leaf spots, and to keep mulch and water consistent.

The summer routine is short but non-negotiable:

• Deep-water new and stressed trees. Slow, deep soakings that reach the root zone beat frequent light sprinklings. A long dry August is when young trees quietly fail.
• Skip heavy pruning. Save structural cuts for winter. Limit summer work to obvious deadwood and hazards.
• Scout for pests and disease. Watch for emerald ash borer in Monroe County, spider mites on stressed evergreens, japanese beetles, and foliar diseases like apple scab and tar spot. Note problems now and plan treatment windows.
• Keep mulch topped up. A steady mulch layer holds soil moisture through the hottest stretch.

What is the fall punch list (September to November)?

Fall is the busiest season on the calendar. It is the best time to plant trees and shrubs, the time to deep-water everything until the ground freezes, and the moment to set up winter protection. Rake and remove diseased leaves so fungal spores do not overwinter, wrap young trunks against sun-scald and rodents, and inspect for structural defects before winter storms arrive.

Run the fall list top to bottom:

• Plant now. Warm soil and cool air let roots establish with less heat stress, which makes early fall the top planting window. Start with the right trees for Rochester's zone 5b-6a.
• Deep-water until freeze-up. The Arbor Day Foundation advises to "keep watering trees on a regular schedule through the fall and until the ground begins to freeze (usually late October or November)," because young trees are especially prone to winter drought injury.
• Clean up diseased leaves. Rake and remove fallen leaves from trees hit by apple scab, tar spot, or anthracnose so spores do not reinfect next spring.
• Protect bark and evergreens. Wrap young trunks against sun-scald and rodents, and apply an anti-desiccant to broadleaf evergreens before hard freezes.
• Skip late feeding. Avoid late-summer and fall nitrogen, which pushes tender growth that will not harden off before frost.
• Inspect for hazards. Rochester's first fall frost arrives in early-to-mid October, and storm season follows. Look for cracks, leans, and dead limbs now, and know what to do with a storm-damaged tree before one comes down.

What about deep winter (December to January)?

Deep winter is mostly a season to leave trees alone. The main active task is responding to snow and ice load: gently brush heavy, wet snow off flexible evergreens and shrubs, but never knock frozen, brittle branches, which snap under the pressure. Otherwise, guard young bark from deer and rodents, watch for storm breakage, and save real pruning for the late-winter window just ahead.

There is little to do beyond monitoring. Do not water (the ground is frozen and roots cannot absorb it), do not fertilize, and do not plant. If a January thaw arrives, you can reapply anti-desiccant to evergreens showing winter burn. Beyond that, plan next season's pruning and treatments so you are ready when the dormant window opens again.

When are the best windows to prune and plant in Rochester?

The short version: prune most shade trees in late-winter dormancy, plant in fall as the first choice or spring as the second, and never prune oaks during the growing season. Rochester's frost-free window runs roughly 145 days, with the average last spring frost in early-to-mid May and the first fall frost in early-to-mid October, which frames every timing decision on this calendar.

If you only remember three rules, remember these. Prune deciduous shade trees when they are bare and dormant, following our pruning-window guide for Upstate NY. Plant in early fall for the best root establishment, or in spring once the mid-May frost risk clears. And leave oaks alone from April 15 to July 15 to keep oak wilt out of your trees.

FAQ

When is the best time to prune trees in Upstate New York?

For most deciduous shade trees, late-winter dormancy (roughly February through March) is ideal, because the bare structure is easy to read and wounds close cleanly as growth resumes. Spring-flowering shrubs are the exception: prune them right after they bloom. Do not prune oaks during the growing season.

When should I fertilize trees and shrubs in Rochester?

Fertilize at leaf-out in spring, and only when a soil test or visible decline shows a real need. Avoid late-summer and fall nitrogen, which pushes tender new growth that will not harden off before the first frost.

When can I plant a new tree in Rochester?

Early fall is the first-choice window, because warm soil and cool air let roots establish with less heat stress. Spring, after the mid-May frost risk passes and the soil is workable, is a solid second choice. Avoid planting in the heat of mid-summer.

Is it too late in the year to do fall tree care?

Not until the ground freezes. Keep deep-watering, especially newly planted trees, until the soil freezes solid, usually late October or November, then switch to winter monitoring. Trunk wrapping and leaf cleanup can continue through late fall.

How do I protect young trees from winter salt and rodents?

Road and sidewalk salt spray can burn evergreen foliage and buds, and mice, voles, and rabbits gnaw young bark under snow. Trunk guards, a plowing plan that keeps salt spray off the plants, and anti-desiccant sprays on broadleaf evergreens all help.

Sources

• Monster Tree Service of Rochester
• Cornell Cooperative Extension of Monroe County: Oak Wilt
• NYS Department of Environmental Conservation: Oak Wilt
• Arbor Day Foundation: Winter Tree Watering Tips
• The Old Farmer's Almanac: Frost Dates for Rochester, NY