The seasons are defined by the following dates: Spring—April 1 to May
31, Summer—June 1 to August 15, Fall—August 16 to November 20, and
Winter—November 21 to March 31.
Most birders will be interested in breeding populations of marsh and
prairie species. For these it would be best to come in June, preferably
during the first three weeks.
For migration, the timing depends on specifics. Warblers generally peak
about the third week of May and again in mid-September. For waterfowl
April and October are probably best. Shorebirds are usually good anytime
from late April to late October, but the first two weeks of May and the
months of August and September are the most consistent. Shorebirding can
be the most productive kind of birding in July and August.
Few people come to North Dakota in winter for the purpose of birding,
but perhaps more should. Although not abundant, many of the regular
winter birds make good additions to the list. Several northern species
that are uncommon over the rest of the United States are often
relatively easy to find here. This is also the time when the birder can
add the most to our knowledge of North Dakota’s birds. There are
relatively few good birders in the state, and many do not get out in
winter as often as they should. Who knows? You may turn up something
extra good, such as a Gyrfalcon or a Boreal Owl. For the northern owls
come after January, when the birds have been pushed south by the colder
weather.