Spring Migration
For a few weeks in the spring and again in the fall, hundreds of species pass through the desert areas. The first of the spring migrants can be detected as early as the first of March! The northbound Spring migration reaches its peak from late April to early May.
Fall Migration
Fall migration, which is Southbound, is underway by early August, and it reaches its peak around the last of September. Sometimes it is difficult to differentiate between northbound and southbound movements, however, because late spring migrants may still be moving north as fall migrants begin their journeys.
Nesting
Nesting occurs from mid-February through June. In the higher elevations, nesting takes place as late as July. May through June is the most productive nesting period.