Early Fall Float Trips
Posted on January 28th, 2021
Early Fall Float Trips: Introduction
As air and water temperatures cool in late August or the first week of September, flows continue to drop and aquatic insect hatches turn back on. The next month or so, basically the month of September, offers the best match-the-hatch fishing of the season. Even large trout sometimes rise to tiny flies, and good fishing is still possible with terrestrial dry flies as well.
Early fall float trips are all about flexibility. If it’s warm and bright, we’ll want to fish hoppers and ants for numbers of free-rising cutthroats on the upper Yellowstone or for rainbows and browns on the lower Stillwater. If it’s cool and gray, it might be prime time to float the Yellowstone’s “town section” or east of Livingston and hope for a few monsters.
This is rapidly becoming the second most-popular period for float trips in the region, after early summer, and for good reason: the weather and water conditions are great, the fish are fat and healthy, and the crowds of general tourists have departed. There can still be quite a few fishing boats out on the water, but except on Labor Day Weekend there are far fewer than during the summer. The Stillwater River in particular is far less busy once September rolls around than earlier.

This beautiful Yellowstone cutthroat ate a #18 Blue-winged Olive dry fly while Walter had the boat pulled into an eddy. The fish ran into the current and he had to hop into the boat to chase it down while his client’s reel screamed.
Here are a couple facts to keep in mind while you read this post:
- Early autumn is our favorite time to guide float trips on the Yellowstone and Stillwater Rivers (provided the Stillwater is high enough, sometimes it’s too low in the fall).
- While there aren’t any monster trout included on this page, every pictured fish here ate a dry fly. In fact, probably 80% of the trout we see on early fall float trips eat dries. Most of the rest eat emergers or small nymphs beneath these dries.
Late Summer Float Trips
Posted on January 28th, 2021
Late Summer Float Trips: Introduction
Late summer begins when rivers drop from the edges of the bushes and get slower. In the meantime, rivers turn crystal clear rather than green and aquatic insect hatches diminish, but terrestrial insects such as grasshoppers and ants begin blowing into the water in greater and greater numbers.
Some rivers get too low and in some cases too warm, but others become less challenging to fish, particularly in terms of the accuracy of casts required. While not quite so consistent as early summer, this period often offers easier fishing from a technical standpoint, and certainly offers slower-paced fishing, since flows are now low and slow enough to pick targets apart rather than blowing by.
For anglers who want to target larger fish on dry flies, as well as numbers on dries and small nymphs, this is a great period.
Early Summer Float Trips
Posted on January 27th, 2021
Early Summer Float Trips: Introduction and Quick Facts
Between the middle of June and early July, runoff recedes and the high season begins. The next month or so finds rivers still running high and fast, but clear. Insect hatches are abundant, including the famous Salmonfly, and the trout are eager to eat after a month or more of high, muddy water.
This time of year typically offers the best caddis, stonefly, and attractor dry fly fishing of the season, especially for experienced clients able to hit small targets along the bank while the boat is jetting downriver in the high flows. This period is also a decent time for big fish on floats, especially for clients interested in fishing big nymphs and streamers.
Since the fishing and weather and water conditions are great at this time, it’s little wonder that this is the absolute peak season for float fishing in the region.

Early summer is an excellent time to target larger brown trout on big nymphs and dead-drifted streamer flies.
- Best Waters: The Yellowstone, Boulder, and Stillwater are our favorite float rivers at this time, and with these “prime” fisheries nearby all on fire, we seldom run float trips elsewhere at this time.
- Three Top Reasons to Come in Early Summer: 1.) This is peak dry fly time on all rivers, 2.) This time of year offers the most consistent float fishing, if not always the best fishing, and 3.) this period offers the most consistent weather and water conditions of the year.
- Three Top Reasons to Avoid Early Summer: 1.) This is the most crowded time of year, 2.) The fishing is very fast-paced and requires accurate casting, which may be a plus or a minus depending on perspective, and 3.) Late summer and early fall are better for large fish on dry flies, though early summer is better on subsurface flies.
- Perfect Clients: Clients with at least some fly fishing experience who enjoy fast-paced fishing and like to rack up the numbers rather than try to sight-fish or otherwise “hunt” a few big fish (though a few big fish are possible in early summer). Really, early summer is great for all clients except those who want a lazy day and those who can’t stand to see any other anglers on the water.
- What Early Summer Does Best: Early summer provides the best attractor, caddis, and stonefly dry fly and dry-dropper fishing of the season; it’s also a good time for big trout using a few techniques and in a few places, though not generally on dries.