Fly Fishing in Colorado: Why September and October are Underrated
Summer may get most of the attention when it comes to fly fishing in Colorado, but some of the best days on the water arrive after the crowds begin to thin.
September and October bring cooler temperatures, changing leaves, quieter rivers, and a shift in trout behavior as Colorado settles into fall. Add golden aspens and crisp mountain mornings, and fall might just be one of the most underrated times of year to cast a line.
Here’s why we love fly fishing Colorado in the fall.
Cooler Water, Active Trout
As summer heat fades, cooler air temperatures help bring water temperatures down across Colorado’s rivers and streams.
Fall is also an important feeding period for trout as conditions begin transitioning toward winter. Fish behavior changes with water temperature, flows, insect activity, and time of day, which makes reading the river especially important this time of year.
For anglers, that can make September and October an exciting time to get on the water and adapt your approach to the changing season.
Fewer Crowds on the Water
Summer is Colorado’s busiest outdoor season. By September, vacations are winding down, kids are back in school, and many visitors begin shifting their attention from summer adventures toward leaf-peeping and eventually ski season.
That can mean a quieter experience along some of Colorado’s rivers and streams.
Instead of sharing a stretch of water with the peak summer crowds, fall fishing can offer a little more room to slow down, read the water, work on your cast, and simply enjoy being outside.
Fall Colors From the River
There are plenty of ways to see Colorado’s famous fall foliage, but standing in a river surrounded by changing aspens is hard to beat.
Colorado’s fall colors generally begin at higher elevations before progressing downhill through September and into October. That overlaps perfectly with fall fly-fishing season, creating opportunities to combine a day on the water with some of the most beautiful scenery of the year.
Depending on where you fish, your backdrop might include golden aspens, cottonwoods lining the riverbanks, or the first dusting of snow on the high peaks.
A Different Kind of Hatch Season
Fall doesn’t mean insect activity disappears.
Blue-winged olives, midges, caddis, and other insects can remain important food sources depending on the location and conditions. Terrestrial patterns may also continue to be productive during warmer stretches early in the season.
At the same time, brown trout become increasingly active as their fall spawning season approaches.
Conditions can change quickly in autumn, so successful fall fishing is less about relying on one particular fly and more about paying attention to what’s happening on the water. Look at insect activity, water clarity, temperature, flow, and where fish are holding before deciding how to fish a particular stretch.
Comfortable Days and Crisp Mornings
September often hits a sweet spot in Colorado: warm sunshine during the day without the intense heat of midsummer.
October brings colder mornings and a greater chance of unpredictable mountain weather, but it can also deliver spectacular fishing days under bluebird skies.
Layers are key. Temperatures can change dramatically from morning to afternoon, especially at higher elevations, so come prepared for everything from sunshine to wind, rain, or even early-season snow.
Fall Is a Great Time to Learn
You don’t need years of experience to enjoy fall fly fishing.
In fact, having fewer people on the water can make this an especially enjoyable time for beginners to learn. A guided trip gives new anglers a chance to practice casting, learn how to read water, understand fly selection, and start recognizing the small details that experienced anglers use to decide where and how to fish.
More experienced anglers can use a guide to explore unfamiliar water, refine technique, or simply spend a day fishing without having to figure out the logistics themselves.
Where to Go Fall Fly Fishing in Colorado
Colorado Wilderness Rides and Guides offers guided fly-fishing trips throughout the Front Range and Rocky Mountains, including Boulder, Golden, Estes Park, Rocky Mountain National Park, Denver, Eldorado Canyon State Park, Summit County, and custom destinations.
Depending on your goals and experience level, trips can range from a half-day introduction to a full day on the water or a completely customized fly-fishing adventure.
Because fall conditions can vary dramatically with elevation, weather, water temperature, and river flows, having a local guide can also help you make the most of the conditions on any given day.
Don’t Pack Away the Fly Rod Yet
Colorado’s first hints of fall don’t mean fishing season is over.
For many anglers, they signal the beginning of one of the most beautiful times of the entire year to be on the water.
September and October bring together cooler temperatures, changing trout behavior, fewer summer crowds, and Colorado’s famous fall scenery. Whether you’re learning to fly fish for the first time or looking for another excuse to spend a day on the river, don’t overlook fall.
Explore guided fly-fishing trips with Colorado Wilderness Rides and Guides and experience Colorado’s rivers before winter arrives.
