Mar 14, If you have oaks in your landscape that need pruning and you live in an area of Minnesota where oak wilt occurs, pruning must be done before the oak wilt fungus and it's insect vector become active. Oak wilt is a fatal disease of oak trees that can be found in some counties of Minnesota.
If you live in an area where oak wilt occurs, it is critical to prune oak trees before the high risk infection period. Sep 21, The University of Minnesota Forestry Department posts the oak wilt risk levels for pruning oaks: high risk in April through June, low risk in July through October, and no risk in November through March.
You can safely prune Minnesota oaks in winter and take appropriate precautions as needed to protect the health of your tree. Feb 11, From July through October, pruning will put oak trees only mildly at risk.
So that means that November through March, during their dormant time, is the ideal time for pruning oaks. The main reason for this pruning schedule is for the prevention of the spread of oak wilt. Sep 26, Oak trees are best trimmed in the winter between November and March. Oak trees are dormant in winter and are less likely to be negatively affected by pruning when in winter dormancy.
That being said, branches which are dead, damaged, or diseased should be removed any time of year (and as soon as possible).Estimated Reading Time: 8 mins. Recommended Timing. To keep trees' health intact, the safest time to trim is during the late dormant season in winter, typically between the months of February and early April. Because deciduous trees are bare at this time of year, gardeners can easily see the branches to make cuts.