09/05/2026
🍂 September is one of the best months to fly fish Colorado.
The mornings are cooler, the rivers are cold again, the summer crowds are beginning to thin out, and fall colors are starting to show. Even better, the trout are feeding.
But September can also be a month when knowing what’s hatching makes a big difference.
We just published our September Hatch Guide, covering the insects you should be looking for on Colorado rivers this month. We take a closer look at:
🎣 Blue Winged Olives — Tiny fall BWOs can produce some incredible dry-fly fishing, especially on cloudy days.
🎣 Tricos — Don’t put that Trico box away yet. These little mayflies remain an important part of a trout’s diet in September.
🎣 Caddis — September can bring a noticeable increase in caddis activity and some excellent opportunities to fish dries.
🎣 Midges — They may be small, but they’re one of the most dependable food sources for Colorado trout year-round.
🎣 Hoppers, ants & beetles — Terrestrials are still very much in play, particularly on warm and windy afternoons.
In the full guide, we explain life cycles, fly sizes, pattern selection, when to fish each hatch, and techniques we use on the water every day.
If you’re planning to fish Colorado this September or simply enjoy learning more about what’s happening beneath the surface, we think you’ll enjoy this one.
👉 Read our complete September Hatch Guide at the link below.
https://www.coloradoriveroutfitters.net/post/september-fly-fishing-hatch-guide-colorado
And if you’d rather experience September fishing with one of our guides, call or text Colorado River Outfitters at 970-236-1937. Fall is a special time to be on the river. 🍁🎣
September offers some of Colorado’s best fly fishing of the year. Cooler water, lighter crowds, fall colors, and hungry trout make it an incredible time to be on the river. Our September Hatch Guide covers Blue Winged Olives, Tricos, caddis, midges, and terrestrials, including the best flies, size...