The Best Time of Day to Fly Fish, by Season
When to be on the water — and when to take a long lunch — across spring, summer, fall, and winter. A simple seasonal clock for trout anglers.
"What time should I show up?" is the most common question new fly anglers ask, and the answer changes completely with the season. Here's the short version.
Spring: late morning into afternoon
Spring water is cold. Insects don't hatch and trout don't feed actively until the sun warms the river a few degrees. The best window is roughly 11 a.m. to 4 p.m. Showing up at dawn in April is usually a long, cold wait.
Summer: dawn and dusk, period
Once daytime water temps push past 65°F, midday is the worst time to fish — for the trout's sake more than yours. Be on the water at first light, off by 10 a.m., and back on around 7 p.m. until dark. Terrestrials in the morning, caddis at dusk.
If a river is hitting 68°F or warmer, take the day off. Catch-and-release mortality climbs fast at those temps.
Fall: mid-morning into early afternoon
Fall mirrors spring. Cool nights pull water temps back into the productive range, and the best fishing usually runs from about 10 a.m. to 3 p.m. BWO hatches in this window can be the best dry fly fishing of the year.
Winter: the sunny middle of the day
In winter, you're fishing the warmest water of the day, which means 11 a.m. to 3 p.m. on a tailwater or spring creek. Tiny midges, deep slow seams, and patience.
The shortcut: solunar plus water temp
The seasonal clock above will get you 80% there. The other 20% comes from solunar feeding windows (major and minor periods) overlaid on water temperature. Fish Tech surfaces both for every river on the map — but if you only remember one rule, remember this one:
Fish when the water is in its active temperature range. Skip the rest.
Put this into practice — see live USGS flows, water temps, and fly recommendations for top fly fishing states:
See all states →- The Best Fly Fishing App in 2025 (And Why Most Generic Fishing Apps Miss the Mark)A fly angler's honest look at what makes a fly fishing app actually useful — live USGS streamflow, water temperature, hatch timing, and fly recommendations — and why general fishing apps fall short for trout.
- How to Read USGS Streamflow for Fly Fishing (Without Overthinking It)A plain-English guide to CFS, gauge height, and water temperature — and the simple rules of thumb that turn raw USGS data into a fishable plan.
- Matching the Hatch When Nothing Is HatchingWhat to tie on during the long, fishless middle of the day — a practical fly selection framework based on water temp, season, and what trout default to when bugs aren't on the water.
Map
Fly Guide