When to Trim Trees in Minnesota — Month by Month

In Minnesota, when you prune matters more than how you prune. The wrong month can introduce oak wilt, Dutch elm disease, or just stress a tree into a slow decline. Here's the calendar.

Quick reference

Tree	Best window	Avoid
Oak (all species)	Nov 1 – Mar 31	April–October (oak wilt)
Elm	Nov 1 – Mar 31	April–October (Dutch elm)
Maple, birch, walnut	Late summer – fall	Early spring (heavy bleeding)
Apple, pear, plum	Late winter (Feb–Mar)	Mid-summer
Evergreens (spruce, pine, fir)	Late winter – early spring	Late fall
Honey locust, ash, linden	Dormant season	Storm season if avoidable
Storm damage	Anytime	—

Oak wilt — the rule that doesn't bend

Oak wilt is a fatal fungal disease spread by sap-feeding beetles attracted to fresh wounds. From April 1 through October 31, even a small pruning cut can kill an oak. The MN DNR enforces a hard "no oak pruning April–July" rule. November 1 to March 31 is the only safe window.

Storm damage exception: if a major branch breaks in summer, paint the wound immediately with tree wound dressing or latex paint to seal it from beetles. Then call an arborist.

Month-by-month plan

• November — start of dormant season. Best month for big oak and elm work.
• December–February — cheapest pricing; frozen ground protects lawns; clearest tree structure (no leaves) for shaping.
• Late February–early March — apple, pear, and stone-fruit pruning before bud break.
• March — last call for oaks and elms. Last call for major shade tree structural work.
• April–May — STOP pruning oaks and elms. Continue spring planting and ornamentals.
• June–July — only emergency / storm work. Trees are actively growing.
• August — light shaping on maples, birch, walnut (less sap bleed than spring).
• September–October — evergreen tipping, hedge work, light cosmetic.

What about young trees?

Trees under 5 years old benefit from structural pruning every 2 years in late winter — train scaffold branches, remove competing leaders, prevent future weak crotches. Cheap insurance against $5,000 storm damage 20 years from now.

Don't do these any month

• Topping — flat-cutting the top of a tree. Kills it slowly, decay enters cuts.
• Lion-tailing — stripping all interior branches. Looks "clean," causes sunscald and wind failure.
• Flush cuts — cutting tight to the trunk. Removes the branch collar, prevents healing.
• Painting non-oak wounds — most cuts heal better open. Only paint oaks April–October.

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