The Boulder River is currently "low and gin clear," making trout easily spooked. As of July 22, 2026, expect good hopper action and morning movements of spruce moths. Water levels will drop in August, leading to wadeable conditions. Late autumn may see migrating brown trout from Yellowstone. Prepare for a technical fishing experience.

The Boulder River is still experiencing winter conditions despite the arrival of spring. While fishing is decent, especially with smaller nymph patterns, water temperatures remain low. Anglers are encouraged to explore better fishing spots like Paradise Valley Spring Creeks near Livingston until the Boulder improves in mid-April.