The Daggett Fire burned less than a tenth of an acre by 10:30 a.m. It is located west of Clear Creek Summit and south of Gardiner Peak.
A helitack crew is dropping buckets of water on the blaze and two engine crews are working on the ground.
A red flag warning has been issued for southwestern Idaho through 9 p.m. Monday. Scattered lightning and thunderstorms are expected through much of the region.