The Stillwater River is returning to cool spring conditions after a brief warm spell. Fishing improves gradually as water temperatures rise, with peak productivity typically after spring runoff.

Montana’s Stillwater River is still running cold despite a warmer-than-average winter, keeping fishing from fully turning on yet. Low flows have trout holding in deeper slots, where patient nymphing has produced action. Here’s what Montana Angler reported on March 6, 2026—and what to expect as spring temperatures rise.