Jason Ensign, 47, died Thursday while operating a dozer on Oregon's Wrights Spring fire after the blaze's rapid growth cut off his escape route, authorities said.
Nearly 14 square miles had burned by Friday with 0% containment east of Chiloquin, where officials cited extremely hot, dry weather and erratic fire behavior.
In Utah, a Sikorsky S-64 Skycrane with 2 people aboard crashed while fighting a separate wildfire near Richfield, and crews could not immediately reach the site because of flames.
That Utah fire had grown to 165 square miles and was 19% contained, with more than 600 personnel deployed as evacuations remained in place and at least 6 structures were destroyed.
The incidents add to a punishing Western fire season driven by drought, heat and wind, after 4 firefighters were killed on a fast-moving Colorado blaze in June.