August in Montana can be a tricky month for anglers — warm afternoons mean we need to keep a close eye on water temps, but early mornings can be pure magic. If you’re willing to set the alarm, you’ll find cool water, active trout, and some of the most unique dry fly opportunities of the season.
Why Water Temps Matter
When river temps climb above 68°F, trout become stressed and struggle to recover after being caught. We recommend carrying a stream thermometer and wrapping up your fishing when temps get too warm. Morning sessions not only help protect the fish, they also offer the best action of the day.
Hatches to Watch Right Now
Spruce Moths – These fluttery, tan-winged critters are buzzing along banks lined with evergreens. Trout love them, and a simple tan caddis or moth imitation fished tight to structure can draw explosive eats.
Tricos – The tiny mayflies are thick on calm mornings, bringing pods of rising fish into tight feeding lanes. A size 20–22 spinner pattern will be your best friend here — bring your patience and delicate presentations.
Terrestrials – August is prime time for hoppers, ants, and beetles. Hopper-dropper rigs are perfect for covering both surface and subsurface action.
Sun Protection Is Essential
Even in the cool morning hours, Montana’s high-altitude sun can be intense. Quality sunwear helps keep you comfortable and safe while fishing. One of our shop favorites is the Simms SolarFlex Hoody, built with UPF 50+ protection, quick-dry fabric, and a lightweight, breathable fit perfect for summer fishing. Pair it with polarized sunglasses and a good buff, and you’re set for a full day outside.
You can check out our full sun protection lineup here: Sun Protection
Final Thoughts
Yes, August can slow down, but it’s also when the crowds thin and the bugs get fun. Set that alarm, bring your thermometer, match the hatch, and soak up the quiet beauty of an early Montana morning.
