If you own oak trees in the Houston metro, the question isn't whether to prune them — it's when. Get the timing wrong and you risk introducing oak wilt, the fungal disease that has killed millions of live oaks across Central and Southeast Texas. Get it right and your trees can stay healthy for another 50 years.
The short answer: November through January
Texas A&M Forest Service and the International Society of Arboriculture both recommend pruning oaks during the dormant winter months — roughly mid-November through late January. During this window, two things work in your favor:
- Oak wilt's vector, the sap beetle Nitidulidae, is mostly inactive in cold weather.
- Oak trees seal pruning wounds slowly, but they're not actively pumping sap that would attract the beetles in the first place.
The danger window: February through June
This is when oak wilt spreads fastest. Sap beetles are most active in spring, looking for fresh sap from any source. A pruning cut on your tree is essentially an invitation. If a beetle has visited an infected tree elsewhere in your neighborhood, it can carry fungal spores directly to your fresh cut.
If you absolutely must prune in this window — say, after storm damage — every cut should be sealed within minutes using pruning paint or wound dressing. We carry pruning paint on every job for exactly this reason.
July and August: a secondary safe window
Late summer is the second-best time to prune oaks. Beetle populations drop in the heat, and the trees are healthy enough to seal wounds quickly. We schedule oak work in July and August when winter availability fills up.
What about emergency cuts?
Storm damage doesn't wait for the calendar. If a limb breaks during the danger window, you have two options:
- Make the cut and seal immediately. Use pruning paint within 5 minutes of the cut. This is what we do on storm response calls.
- Make a temporary cut, seal, and finish later. Sometimes we'll cut back just enough to remove the immediate hazard, seal it, and return for the proper structural cut in winter.
Other species: more flexible
Oak wilt timing only applies to oaks. Pecans, magnolias, sweet gums, and crape myrtles can be pruned year-round (though species-specific timing optimizes results). Our tree trimming service page covers the broader pruning calendar.
The bottom line for Houston homeowners
Plan oak work for late fall or winter. Book your estimate by September if you want a January slot — our winter calendar fills fast across Sugar Land, Memorial, the Heights, and River Oaks where mature oaks dominate. If you've got an active hazard, call us anytime — we'll cut and seal safely regardless of the season.