- Peak Broad-winged Hawk migration is generally
between the 15th and 25th of the month, although good
numbers have been observed as early as the 12th. Major
flights of migrating Broad-wings may be seen anywhere in
the county. Large numbers have been counted at Schooley
Mill Park, Centennial Park, and west of Ellicott City.
- Although Merlins may be sighted as early as late
August, numbers increase by the middle of this month.
- Shorebirds can still be found on mudflats, along pond
edges, and in short-grass areas throughout the month.
- From late August to mid-September, check extensive
short-grass areas such as turf farms for Buff-breasted
Sandpipers. American Golden-Plovers may drop in this
month, while Black-bellied Plovers may continue through
October. All share their favored habitat with
ever-present Killdeer. On weekdays, the sports fields at Western
Regional Park are worth scanning.
- Migrant terns over lakes and reservoirs continue to
be a good possibility throughout this month.
- Barred and Great Horned owls are again calling
- Whip-poor-wills typically leave this month, although
it has become increasingly hard to tell because there are
few, if any, breeding locally.
- Ruby-throated Hummingbirds will be going through in
dwindling numbers by the end of the month; a few may
linger into early October.
- Red-headed Woodpecker migration seems to peak the
last two weeks of this month and the first week of
October. Keep an eye out for brown-headed juveniles as
well as adults.
- Yellow-bellied Sapsuckers begin to show up the third
week of the month.
- Most flycatchers, other than Eastern Phoebes which
remain into October or later, are gone by mid to late September; a
few calling pewees have been detected until mid-October.
- Red-breasted Nuthatches may begin to appear in pine
or mixed pine/deciduous woods. The first migrants are
often seen at feeders.
- Kinglets may begin to arrive in September, although
the earliest Ruby-crowns may have put in an appearance in
late August. The majority of both species do not move in
- Look for the largest number of migrating warblers
this month. They are usually seen in small groups,
frequently in the vicinity of water, often in association
with mixed chickadee, titmouse, and nuthatch flocks.
Migrants are often found in black walnut and various
species of oak, hickory, ash, and willow trees. Grapevine
and poison ivy tangles are also excellent possibilities.
After cool nights, look for activity in areas that are
warmed by early sun. During the last few hours of
daylight, there is another period of feeding before the
- Take a second look at any Tennessee Warbler to be
sure you don't have a Philadelphia Vireo.
- Autumn is the time to watch for the elusive Mourning
and Connecticut warblers. The Mourning's migration period
runs from late August to early October, although
September brings the largest numbers. Connecticut
Warblers (which are not spring migrants in Maryland)
should be looked for from the beginning of the second
week in September to mid-October. The last half of
September usually is the peak period.
- From mid-September to late October, search brushy
weed patches, especially those close to water, for
- Both White-throated Sparrows and Dark-eyed Juncos may
arrive during the first half of the month, but numbers
are few until late September or early October.
- Rose-breasted Grosbeak numbers normally peak the last
half of the month.
- Look for migrating Bobolinks from early September to
- While scanning the sunny late summer and autumn skies
for migrating birds, note the passage of Monarch
butterflies. They may begin moving an hour or two after
sunrise and may be seen at altitudes of hundreds of feet
as well as close to the ground. Several dozen an hour
will frequently be tallied.