Bewick's wrens are found in Oasis Valley regularly through most of the year, least in spring. They are not common but one may hang out in underbrush, thickets, and cottonwood groves for weeks at a time.
They might breed here, as they do to the south in Ash Meadows, but I have not heard regular singing in spring. They may go up to nearby mountain ranges to nest, such as the Grapevines 20 miles to the west. Its spring occurrence is quite sporadic, and fall sightings are more usual.
^A wren high in an old cottonwood tree among the canopy branches, in October.