The upper section of the main fork of the Cimarron are an excellent place to enjoy small stream fishing for wild trout. The further you hike, the fewer people you will see and the fishing will improve with each bit of effort. Expect dry dropper for the best fishing, though you can certainly throw a single or double dry with success as well. The river easily gets blown out from too much rain or runoff so mid to late summer is the safest bet to not get into blown out water. The river is small up here and can easily be fished from either side of the river when flows are right. Make sure if you encounter another angler, to give plenty of space for the other angler. I’d skip at least 300 yds up or downstream to ensure you don’t spoil the fishing for the other anglers in this pristine and wild environment.
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Cimarron River – Upper Main Fork Fishing Information
Upper Section - near Ouray, CO
- Fish: Some Small-Sized Fish
- Popularity: Low
- Difficulty: Medium
- Accessibility: Medium
- Best Techniques: Dries & Nymphs
- Best Seasons: Spring - Fall
- River Type: Small Freestone
- Fish Types: Rainbow Trout, Cutbow Trout, Cutthroat Trout, Brook Trout
- Dog Friendly: Yes
Located in the Gunnison River Basin near Ouray, CO
Hatch Charts
Knowing what flies to use is only have the battle. You have to know when the insects are active on the water and when it's likely the trout are feeding on them. Refer to our hatch charts below to understand when the insect categories and some of the possible hatches on the river.
Midge Hatches
Midges hatch year round, but their importance is from September through winter into April. During the warmer months, the trout often focus on larger insects as they are more active on the water like mayflies, caddis and stoneflies.
- Colors: Black, White, Gray, Cream, Olive, Red, Brown, Blue, and Purple
- Sizes: #16 - #24
Mayfly Hatches
Aside from Blue wing olives, mayflies are active most commonly from May to August in Colorado. There are many different mayfly hatches found on most rivers and the most common are listed below.
- Blue Wing Olive: September throut winter to April
- Colors: Green/Olive
- Sizes: #16-24
- Pale Morning Dun: June to Mid September
- Colors: White, Yellow
- Sizes: #14 - #20
- Green Drakes: June to August
- Colors: Olive/Green
- Sizes: #8 - #14
Caddis Hatches
Caddis hatch starting early in May and continue to the end of October.
- Colors: Olive, Green, Yellow, Tan, Orange, Brown and Black.
- Sizes: #10 - #20
Stonefly Hatches
We have some great stonefly hatches in Colorado and while not all rivers carry all species of salmonflies, you can often fish stonefly adult patterns with confidence from May to September. Start off in bigger sizes and get smaller till September hits (size 8 - 16)
- Little Black Stone: January to May during warm sunny days.
- Colors: Black, Grey
- Sizes: #16 - #20
- Golden Stone: June to August
- Colors: Yellow, Tan
- Sizes: #8 - #14
- Yellow Sally Stonefly: Mid June to August
- Colors: Yellow, Tan
- Sizes: #12 - #18
Terrestrial Activity
Terrestrials don't hatch since they are out of the water, but they can have importance starting in Mid April and ending in September.
- Ant Patterns: Mid April - September
- Colors: Black, Tan, Red, Brown
- Sizes: #14 - #18
- Beetles: May to September
- Colors: Black, Blue, Purple
- Sizes: #14 - #18
- Hoppers: June to September
- Colors: Tan, Yellow, Olive, Red, Pink, Purple
- Sizes: #8 -#16
- Flying Ants: Mid August to Mid September
- Colors: Red, Black
- Sizes: #14 - #18
Cimarron River – Upper Main Fork Flies
These are the the top flies we sell for this river. Use the hatch chart above to know what flies you will want to have in your fly box during your adventure on the river and then select the flies here 30 days before your trip to get them at a great price. All of our flies are hand tied to each order to ensure quality and to keep our prices low for you.
Click on a fly below to select a size and color for purchase.
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Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page -
Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
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Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
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Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
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Original price was: $2.75.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
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Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
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Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
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Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
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Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
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Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
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Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
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Original price was: $3.00.$1.50Current price is: $1.50. Select options This product has multiple variants. The options may be chosen on the product page
Top Fly Assortments
Our fly assortments make fly selection easy. We take our entomology knowledge and years of fly fishing experience on these rivers to bring you the right fly patterns, including the correct colors, sizes and quantities to set you up for success. A good selection of flies will prepare you properly for anything the trout may be eating on the river and our fly assortments are specifically curated to maximize your success. Take a look at the assortments we provide below and add one to your box today. Use coupon code AST50 for $50 off and free shipping on these as well, just to help make fly fishing a little more affordable!
Click on any of the pictures to see what flies, colors and sizes we recommend in each assortment.
Cimarron River – Upper Main Fork Access Map
View our access map for the Cimarron River – Upper Main Fork and learn public and private access points as well as other notable features around fly fishing this river. We include headwater and confluence data and in an effort to not "hotspot" river access points that are better than others, we list every access point available. This serves two purposes. First, it keeps us from hotspotting, which is just showing the best spots and bringing unwanted and harmful attention to the specific access point. The second reason is while we want to help you catch fish and find great places to explore, we don't want to spell it all out for you. If you get it all spelled out, we're doing the exploring, not you. Missing out on the journey of exploring places to fly fish is one of the more enjoyable aspects of fly fishing. While not everyone has time to go explore everything in person, we provide some of the top level data to help you know if something is worth your time, then pass it off to you to explore and find your own adventure. Now enjoy the info, if you're on this page then this river is worth exploring! Go out and find some memories.
Cimarron River – Upper Main Fork Tips & Resources
Use these epic resources to get ready for your adventure. Whether you're planning your trip, learning your insects, improving your fishing with expert tips or getting detailed resources from the USGS streamflows or DoW, we got you covered to help you find the river and find the success you want.