Summer Heat and Trout: Fishing Smart in Hot Weather

July and August bring the year's best dry fly fishing — and the year's most stressed trout. Fishing well in the heat means fishing smart, both for your catch rate and for the fish. Here's how our guides handle it.

Carry a thermometer and respect 67

Trout mortality climbs fast in warm water, even with careful handling. Our rule: check water temps, fish hard when it's under 65°F, think twice at 65–67, and stop at 67. Warm water holds less oxygen, so a fish that fights in 68-degree water may swim away and still not survive. A stream thermometer costs less than a fly line and makes you a more responsible angler all summer.

Fish early — it fixes everything

Rivers hit their coldest an hour after first light. In midsummer, being on the water at 6 a.m. means cool temps, active fish, and the best terrestrial and caddis activity of the day. By mid-afternoon on a 95-degree day, do the fish a favor and go organize your boxes.

Chase cold water

Elevation and dam releases are your friends. The Gunnison Gorge runs cold out of the bottom of Crystal Dam all summer — it's why the Gorge stays excellent when freestones get warm. Higher up, the San Miguel's upper reaches and high-country creeks stay in the safe zone. When in doubt, call the shop — we watch temps daily and will tell you straight where to go (and where to skip).

Handle fish like it's hot — because it is

Heavier tippet to land fish faster, rubber net bag, keep them wet, no grip-and-grins in the gravel. A ten-second release in the shade of your net beats a photo shoot every time in August.

Want to fish the coldest, best water of the summer with someone who knows it? That's exactly what our guided trips are for.