When does the Midge hatch?

The Midge typically runs for 52 weeks. Peak emergence occurs in the midday.

What water temperature triggers the Midge hatch?

The Midge hatches when water temperature is between 32°F and 60°F, with peak activity around 40°F.

Griffith's Gnat #20-24, Zebra Midge #20-22, WD-40 #20, Disco Midge #22.

Hatch profile

Chironomidae spp.

MidgeMidday

Water-temperature trigger

30°F32–60°Fpeak 40°F80°F

Top fly patterns

Year-round food source — the only consistent option on tailwaters in winter. On cold sunny days look for noses sipping clusters in slow water.

Best rivers

Other rivers with Midge activity

Bield: Fish watches USGS water-temp gauges for your home water and pings you when conditions hit the 32–60°F trigger window.