Step into a fly shop near any well-known trout river in Montana, Idaho, and Wyoming and take a look in their fly bins. It wonāt take long to figure out the favorite hatch of local guides and anglers. On the Henryās Fork near Last Chance the bins are stocked with drakes and duns. On the Madison near the cowboy town of Ennis, fly shops never run out of stoneflies and caddis. For the Missouri and Bighorn Rivers, anglers anticipate the arrival of Pale Morning Duns followed by clouds of billowing tricos.
Hatches, and the rising trout that hopefully feed on them, are at the root of why we fly fish. Casting a dry fly to a rising trout is a core element of our sport. Like a bartender won't have a career it if they canāt shake or stir it, a fly fishing guide wonāt last long if he or she doesnāt enjoy matching the hatch. And, for any angler who is devoted to fly fishing to rising trout or just wants to do it more often, weāve created this list of the best hatches in the Rocky Mountain Westā¦and where to find them.
Salmonflies
Often the hatch with the most sex appeal, yet hardest to hit right. Salmonflies are in the stonefly family and on most rivers hatch at the tail end of snowmelt runoff. Timing for this hatch is paramountāarrive a few days early and the rivers are too muddy to fish, yet arrive a few days too late and the hatch has already moved upstream. But, time it just right and youāre likely to have some of the most exciting big fly-big fish fishing of the season.
Time Frame: May and June; sometimes as late as early July
Most Popular Rivers: Madison, Yellowstone, Henryās Fork
Best Kept Secrets: Big Hole, Blackfoot
Pale Morning Duns
This mayfly hatches on nearly every trout river in Montana, Idaho, and Wyoming. But, they are star of the show on the region's tailwater rivers. The Bighorn, Missouri, Henryās Fork, South Fork of the Snake, and a few others are home to an abundance of Pale Morning Duns (PMD). Anglers often enjoy fly fishing during a PMD hatch as the insects often hatch in riffles, forcing the trout to be a tad more opportunistic.
Time Frame: June and July
Most Popular Rivers: Missouri, Henryās Fork, Bighorn
Best Kept Secret: Beaverhead, Madison
+ The Top 12 Pale Morning Dun/PMD Flies
Caddis
Every trout river in the world is home to caddis. In fact, many anglers probably caught their first trout on a caddis pattern. Hatching throughout the year in a variety of species, it is safe to say always be prepared for this hatch. That being said, there are some unique hatches of this active insect. Montanaās Smith River is known for very prolific caddis hatches in mid and late June. This five-day and four-night floating and camping trip has fishing that is only matched by the spectacular scenery. Idahoās Middle Fork of the Salmon is another well-known fishery and home to abundant hatches of caddis.
Time Frame: June through October
Most Popular Rivers: Smith, Middle Fork of the Salmon
Best Kept Secret: Waters flowing out of Yellowstone National Park or Glacier National Park
+ The Top 9 Mother's Day Caddis Flies
Blue Winged Olives
Primarily a spring and fall season mayfly, hatches of Blue Winged Olives reward the diehard angler. Known to hatch on rainy or snowy days when the weather turns nasty, these small mayflies drift along the surface like tiny sailboats. The trout respond accordingly and if conditions are rightāovercast skies and very calm windsāanglers seeking dry fly nirvana will find it during a Blue Winged Olive hatch.
Time Frame: September and October and March and April
Most Popular Rivers: South Fork of the Snake, Kootenay, Missouri
Best Kept Secret: Yellowstone, Madison
Terrestrials: Hoppers, Ants, and Beetles
Technically, these insects to do no hatch from the water. However, these land-dwelling insects oftenāand not voluntarily, mind youāfind themselves on the water. Trout are opportunistic feeders and if there are enough grasshoppers, ants, or beetles on the surface of the water, fish will follow suit and feed on these land-based insects. Because a variety of sizes and shapes of terrestrials exist, fly fishing terrestrials is an exciting component of dry fly fishing for rising trout.
Time Frame: late July through September
Most Popular Rivers: Yellowstone, Bighorn
Best Kept Secret: Flathead River, Middle Fork of the Salmon, Smith River
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