When does the Yellow Sally Stonefly hatch?

The Yellow Sally Stonefly typically runs for 5 weeks. Peak emergence occurs in the afternoon.

What water temperature triggers the Yellow Sally Stonefly hatch?

The Yellow Sally Stonefly hatches when water temperature is between 58°F and 70°F, with peak activity around 64°F.

Yellow Sally Stimulator #14-16, Yellow Stonefly Nymph #14, Yellow Elk Hair Caddis #14.

Hatch profile

Isoperla spp.

StoneflyAfternoon

Water-temperature trigger

30°F58–70°Fpeak 64°F80°F

Top fly patterns

Common on freestone rivers. Adults flutter back to lay eggs on warm afternoons — trout target the egg-laying females.

Other rivers with Yellow Sally Stonefly activity

Bield Fish watches USGS water-temp gauges for your home water and pings you when conditions hit the 58–70°F trigger window.