Decision guide
When to Clear Land: Season and Timing in PA and DE
Birds, bats, seed and soil each have a calendar. Here is what the agencies and extension services say, so you can plan clearing around all four.
Late fall through winter is the window most agency guidance points to. FWS says to schedule vegetation removal outside peak bird breeding, and its bat guidance sets pup season at June 1 to July 31. Frozen or dry ground limits rutting. Rules vary by parcel, so confirm with the agency.
The year at a glance
No single month is right for every parcel. Birds nest, bats roost in trees, invasive shrubs set seed and the ground goes from frozen to soft. The table puts the figures the agencies publish in one place. It describes federal and state guidance, and it is not a legal opinion.
| When | Wildlife and rules | Plants | Ground |
|---|---|---|---|
| November 15 to March 31 | FWS Indiana bat guidance for Pennsylvania: where swarming habitat is affected, only cut trees between November 15 and March 31. Bats are hibernating. This is outside the April to August bird nesting months FWS cites. | Leaf-off. Penn State says winter suits non-suckering woody plants and woody vines. | Frozen or snow-covered ground can cut compaction and rutting (MSU). A thaw changes that. |
| April 1 to May 15 | FWS northern long-eared bat: active season starts April 1. Spring staging runs April 1 to May 15 near hibernacula. PGC: Indiana bat females arrive mid-April to late May. Bird nesting generally runs April to August, varying by place (FWS). | See the invasive seed section below. | Forest Service: work dry soils. |
| June 1 to July 31 | FWS northern long-eared bat pup season. PGC: Indiana bat births from mid-June to early July, young fly mid-July to early August. | Growing season. | Dry soils are better than wet (Forest Service). |
| August to October | FWS: fall swarming August 15 to November 14 near hibernacula. For summer habitat the Indiana bat guidance allows cutting from October 1. | Penn State: autumn olive fruit forms in late summer and persists through fall, and birds spread it. | Forest Service: work dry soils. |
The U.S. Fish and Wildlife Service says its bird measures cover federal rules only and do not include state and local rules. The same is true of any single table, including this one. This is general information, confirm with the township or agency for your parcel.
Nesting birds
The Fish and Wildlife Service says most bird nests are protected under the Migratory Bird Treaty Act, and that it is illegal to destroy a nest that has eggs or chicks in it or young birds still dependent on the nest. It notes that ground nests and cavity nests are hard to see, so they are more likely to be destroyed by accident.
The FWS avoidance measures say to schedule vegetation removal, trimming and grading of vegetated areas outside the peak bird breeding season as far as practicable, and to use tools such as IPaC to find peak breeding months for local species. When work cannot avoid nesting season, the measures call for a survey for active nests generally no more than five days before the work, and a buffer around any nest found. If active nests or breeding behavior are seen, no vegetation removal should proceed until the nestlings have fledged or the nest fails.
Bat roosting seasons
Several Pennsylvania and Delaware bats roost in trees in summer. The Pennsylvania Game Commission says Indiana bat females arrive at summer maternity sites from mid-April to late May and form small colonies under loose bark. They give birth from mid-June to early July, and young bats fly by mid-July to early August. The Game Commission lists the Indiana bat as endangered in Pennsylvania.
The Fish and Wildlife Service gives dates for planning. Its Pennsylvania Indiana bat guidance says that for project areas affecting summer habitat, trees should be cut only between October 1 and March 31, and for areas affecting swarming habitat near hibernacula, between November 15 and March 31. It adds that all tree removal within known Indiana bat habitat, regardless of the amount, is subject to the seasonal restriction. For the northern long-eared bat, FWS recommends tree removal outside the pup season of June 1 to July 31 and, where possible, outside the active season of April 1 to October 31.
Delaware DNREC publishes dates for bats in buildings and not in trees. It says the maternity season for little brown and big brown bats in Delaware is generally May 15 to August 31, and that complete exclusions should not happen in that window. That applies to structures such as barns, and a barn on your property is worth a look before any work nearby.
Invasive seed set
Penn State says autumn olive fruit forms in late summer, persists through fall before falling, and is readily dispersed by birds, and that the shrub can fruit in as few as three years. Clearing a fruiting shrub in fall moves seed. That is one reason to treat dormant-season work, before fruit, as the first choice for woody invasives.
Penn State says mechanical cutting is useful against non-suckering woody plants and woody vines in winter, and that cutting suckering species does not affect the root system and results in more stems over a wider footprint. It also says forestry mowing a stand of exotic shrubs and then managing the resprouts in later growing seasons can have value. FWS adds a cleaning step for equipment: wash vehicles and boots before entering sensitive habitat to avoid carrying in non-native plants.
Frozen ground, wet ground and thaw
MSU Extension says logging on snow-covered, frozen ground may reduce or eliminate soil compaction and rutting, and warns that packed snow trails can inhibit water movement at spring melt and cause temporary ponding. The Forest Service advises working dry soils, notes that wheeled carriers rut wet soil, and finds that tracked machines cause less disturbance. Clemson reports that bulk density rose by up to 50 percent over the first three passes in the studies it reviewed, and calls avoiding wet areas the best way to limit compaction.
The practical read is simple. Winter ground that is truly frozen and dry fall or summer ground are the favorable windows for soil. A mild, muddy winter is not. We look at the ground on the site walk and again before equipment moves in.
Questions about clearing season
Sources: U.S. Fish and Wildlife Service, Bird nests, U.S. Fish and Wildlife Service, Nationwide Avoidance and Minimization Measures for Birds, U.S. Fish and Wildlife Service, Northern Long-Eared Bat Conservation Recommendations, U.S. Fish and Wildlife Service, Indiana Bat Conservation Plan Guidance, Pennsylvania, Pennsylvania Game Commission, Indiana Bat, Delaware DNREC, Best Management Practices for Bat Exclusions, Penn State Extension, Autumn Olive, Penn State Extension, Winter Invasive Plant Control, MSU Extension, Winter timber harvest, Clemson Land-Grant Press, Logging Operations and Soil Compaction, USDA Forest Service, To Masticate or Not (RMRS-GTR-381). These are agency and extension statements, not a legal opinion. This is general information, confirm with the township or agency for your parcel.
When are nesting birds a concern for clearing?
FWS says destroying a nest with eggs or chicks is illegal under the Migratory Bird Treaty Act, and advises scheduling vegetation removal outside the peak breeding season. Its guidance on nests on structures says nesting generally runs April to August, varying by location.
What dates apply to bat roosting and tree cutting?
FWS recommends northern long-eared bat tree removal outside June 1 to July 31, and its Pennsylvania Indiana bat guidance allows summer habitat cutting only October 1 to March 31. These apply in known habitat. Confirm with FWS or the Game Commission.
Is fall a good time to clear invasive shrubs?
Penn State says autumn olive fruit forms in late summer and persists through fall, and birds spread it. Cutting fruiting shrubs can move seed. Winter cutting is useful on non-suckering woody plants, with resprouts managed later.
Is frozen ground better than wet ground for clearing?
MSU Extension says frozen or snow-covered ground may reduce or eliminate compaction and rutting. The Forest Service advises dry soils and notes tracked machines rut less than wheeled ones. Soft, muddy ground is the worst case.
Call, or send the details.
(484) 486-7272hello@huntlyland.com. Send the town, rough acreage and two or three photographs. We reply with site-walk times, and a written plan follows the walk.
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