A Month-by-Month Michigan Tree Care Calendar

Trees don't run on our schedule — they run on the seasons. In Michigan, that means a hard freeze, a muddy thaw, a short humid summer, and everything in between.

Knowing what to do when keeps your trees healthier, safer, and easier on your wallet. Here's a month-by-month guide built for our climate.

Work with the seasons, not against them

Most of the tree trouble we get called out for traces back to timing — an oak pruned in July, a young tree that went into winter bone dry, deadwood nobody dealt with until it was hanging over the deck. That's rarely bad luck. It's usually just a schedule that got away from someone, one busy month at a time.

The good news is that the calendar does most of the thinking for you. Match the work to the season and your trees stay healthier, safer, and cheaper to keep standing. Get the timing wrong and you can undo a year of good growth with one poorly timed cut. Here's the year, month by month — print it, stick it on the garage wall, and you'll always know what's coming next.

Winter: January–February

January

Dead of dormancy, and a good time to think. With the leaves down you can read a tree's true structure, so plan any major pruning now. After heavy wet snow, gently brush the load off evergreen branches — blue spruce, white pine, arborvitae — so limbs don't bend and snap. Keep an eye on ice buildup.

February

The prime pruning window opens. Trees are dormant, disease pressure is low, and wounds heal fast come spring. This is the heart of our tree trimming and pruning season, and it's still safely inside the November–March oak window. Booking now beats the spring rush.

Early spring: March–April

March

Early March is your last good stretch for major pruning and oak work before the sap and the beetles wake up. Watch for thaw and wind damage — saturated soil plus a gusty day equals uprooted trees. Check thin-barked trunks for frost cracks.

April

Buds break and leaves flush. Stop major pruning now, oaks especially, since oak wilt beetles get active. It's a great time to plant, though — if you're adding to the yard, early spring is ideal for tree planting and transplanting. Mulch properly: a flat doughnut, never a volcano piled against the trunk.

Late spring: May

May

Leaves are fully out and the growing season is on. Fertilize only if a soil test says the tree actually needs it. Start scouting for trouble — ash thinning at the top, off-color needles, chewed leaves. Hold off on heavy pruning, and keep any new plantings watered.

Summer: June–August

June

Peak emerald ash borer flight. Check ash for D-shaped exit holes and pale woodpecker blonding. If you spot the signs, our tree disease and pest treatment crew can assess whether the tree is worth treating. Keep pruning light — deadwood and clearance only, and no oaks.

July

Heat, and sometimes drought. Water young and newly planted trees deeply and slowly; a long soak beats frequent sprinkles. Check any hemlocks for hemlock woolly adelgid — small white cottony specks on the undersides of the needles. When summer storms roll through, clear hazards fast.

August

Keep watering through dry stretches. Keep scouting for disease and insect damage. Still not the time for big cuts. And start thinking ahead — fall is a fine time to plant.

Early fall: September–October

September

Cooler and wetter, which makes it prime time to plant and transplant so roots settle in before the freeze. Don't fertilize now — you don't want to push tender new growth heading into winter.

October

Leaves come down and structure shows again. Planting is still good early in the month. Keep watering evergreens right up until the ground freezes, since they lose moisture all winter. Rake up and toss diseased leaves to cut down next year's fungal pressure.

Late fall: November–December

November

The dormant pruning window reopens — and so does the safe oak window. Wrap young, thin-barked trees like maple and fruit to prevent sunscald and frost cracks. Give everything a final deep watering before freeze-up, and consider cabling or bracing vulnerable trees before ice season.

December

Trees are dormant, so it's fine to prune most species. Gently knock heavy wet snow off evergreens before it compacts. Take a slow walk around the yard and note any leaners or big deadwood to deal with over the winter.

A few rules that hold all year

• Oaks: November through March only. Every other month, a fresh cut risks oak wilt.
• Water what you planted. New trees need help through their first couple of summers.
• Mulch like a doughnut, not a volcano. Piling mulch on the trunk rots the bark.
• Safety cuts don't wait for a season. A cracked or hanging limb over the house comes down now, whatever the month.

Every yard is a little different, and so is every tree. This calendar is a solid framework, but the right timing for your specific trees depends on their species, age, and health.

Want a plan tailored to your yard?

We know Mid-Michigan trees because we work on them year-round, from St. Johns to Lansing and the towns in between. If you'd like a straight assessment and a plan for the season ahead, we'll come out and take a look. Hayworth Tree Service is family-owned, licensed and insured. Call us at (208) 635-2100 for a free, no-obligation estimate.