Ask ten Texas homeowners when to trim an oak and you'll get ten different answers. Here's the straightforward version for North Texas: late fall through winter is the best window, roughly November through January. The tree is dormant, its structure is easy to see without leaves, and, most importantly, the risk of spreading oak wilt is at its lowest.
Why February through June is off-limits for oaks
Oak wilt is a fungal disease that kills red oaks in weeks and weakens live oaks over months. It spreads two ways: through root grafts between neighboring oaks, and by sap-feeding beetles that carry spores from infected trees to fresh pruning wounds. Those beetles are most active from February through June, which is exactly when a fresh cut is most dangerous. The Texas A&M Forest Service guidance is simple: avoid pruning oaks in those months unless the limb is an immediate hazard.
When cuts can't wait (a cracked limb over your driveway, storm damage), the wound should be painted immediately and tools disinfected between trees. Every fresh wound is a potential entry point.
What winter pruning should include
Dormant-season pruning is the time for structural work: removing deadwood, thinning crossing or rubbing branches, lifting the canopy for clearance over roofs and driveways, and correcting the shape of young trees. On mature oaks, the goal is never to take a lot. It's to remove the right branches. A good rule of thumb: if someone proposes removing more than about a quarter of a healthy oak's canopy, get a second opinion.
What about other trees?
The oak-wilt calendar doesn't apply to every species, but the dormant season is still ideal for most shade trees: cedar elms, pecans, and Chinese pistaches all prune well in winter. Crape myrtles are best pruned in late winter before spring growth, and lightly: the flat-topped "crape murder" cut weakens the tree and ruins its form. Flowering ornamentals that bloom on old wood are the exception. Prune those right after they finish blooming instead.
The bottom line
If your oaks haven't been pruned in a few years, late fall is the time to schedule it. You'll get healthier trees, a lower disease risk, and a crew that can actually see what it's cutting. Learn more about our trimming and pruning service, or get a free on-site assessment and we'll tell you exactly what your trees need.
Common Questions
Can I trim my oak tree in spring?
It's best avoided. February through June is the high-risk window for oak wilt transmission in Texas, when beetles can carry the fungus to fresh pruning wounds. If a limb is hazardous, it should still be handled promptly, with the cut painted immediately.
Do you paint pruning cuts on oaks?
Oak wounds should be painted right away, in any season, to block the beetles that spread oak wilt. It's standard practice for oak work in North Texas.
How often should mature oaks be pruned?
Most healthy mature oaks benefit from professional pruning every 3 to 5 years: mainly deadwood removal and clearance. Young trees need more frequent structural pruning in their first decade to develop a strong form.
Related: Oak wilt in Texas: signs, spread, and what to do, the disease behind the February-through-June pruning rule.