Rocky Mountain National Park (RMNP) is one of Colorado’s most iconic fly fishing destinations, and for good reason. With its pristine high-alpine lakes, clear mountain streams, and breathtaking backdrops, RMNP offers anglers the chance to target Colorado’s native trout species: the cutthroat. Whether you’re new to the sport or an experienced fly fisher, pursuing cutthroat trout in the Park is a rewarding and uniquely Colorado experience. Here’s everything you need to know to plan your next trip.
Why Target Cutthroat Trout in RMNP?
Cutthroat trout are not only beautiful, they’re also native to the Rocky Mountains, making them a special catch in their natural environment. Several subspecies exist in Colorado, but in RMNP, you’re most likely to encounter the Greenback Cutthroat, Colorado’s state fish, and a true conservation success story.
Targeting cutthroat trout in RMNP allows anglers to support native fish conservation while enjoying the challenge of catching a species known for its wary nature and striking colors. Many areas of the Park are designated as catch-and-release for cutthroat, so proper handling and barbless hooks are encouraged to help preserve these populations for generations to come.
Where to Fly Fish for Cutthroat Trout in Rocky Mountain National Park
You’ll find cutthroat trout throughout RMNP, from high-country lakes to pocket-water streams. Here are some of our favorite locations:
Top Spots for Cutthroat Trout in RMNP
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Ouzel Lake – A scenic hike brings you to this quiet lake with healthy populations of native trout.
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Sandbeach Lake – Offers stunning views and some of the Park’s larger cutthroat trout.
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Upper Big Thompson River – Great for technical stream fishing with dry-dropper rigs.
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Fern Lake & Odessa Lake – Backcountry gems with solid fishing and solitude.
These waters often require a hike to access, but that’s part of what makes them so rewarding. Less pressure often means more active fish and better memories.
When Is the Best Time to Catch Cutthroat Trout in RMNP?
Cutthroat trout are most active in late spring through early fall. While snowmelt can make early-season fishing tricky, mid-June through mid-September is prime time.
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June–July: Hatches begin and water levels drop, perfect for dry flies.
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August: Stable conditions and fewer crowds.
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September: Beautiful foliage and aggressive fish preparing for winter.
Pro tip: Mornings and evenings tend to fish best during the heat of summer. Bring layers, even in July.
What Flies Work Best for Cutthroat Trout?
Cutthroat are known to rise readily to a well-presented dry fly, especially in less-pressured backcountry lakes and streams. That said, matching the hatch can make all the difference.
Top Flies for RMNP Cutthroat
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Dry Flies
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Parachute Adams
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Elk Hair Caddis
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Green Drake
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Nymphs
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Copper John
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Pheasant Tail
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Zebra Midge
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Streamers (for deeper lake fishing)
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Woolly Bugger
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Mini leech patterns
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A classic dry-dropper setup is ideal for stream fishing, while lake fishing might call for small streamers or suspending nymph rigs.
Essential Gear for Cutthroat Trout Fishing in RMNP
Fishing in the mountains is a bit different than fishing roadside rivers. Here’s what we recommend packing:
Gear Checklist
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3–5 wt fly rod (8’6”–9’ preferred for versatility)
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Floating line and fluorocarbon leader/tippet (5x–6x)
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Lightweight waders or wet-wading shoes (depending on season)
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Fly box with dries, nymphs, and emergers
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Backpack with food, water, and safety gear
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Bear spray, sunscreen, and bug spray
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Lightweight net and barbless forceps
RMNP involves a fair bit of hiking, so pack light but be prepared. Always check the trail and weather conditions before heading out.
Regulations and Permits for Fly Fishing in RMNP
To fish in RMNP, you’ll need a valid Colorado fishing license, which you can purchase online or at Kirks Flyshop. Additional RMNP-specific rules include:
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Artificial flies and lures only
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Barbless hooks are required in some areas
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Catch-and-release encouraged for native species
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No felt soles allowed (to prevent the spread of invasive species)
Be sure to read current regulations before your trip: RMNP Fishing Regulations
Go with a Local: Guided Cutthroat Trout Trips with Kirks Flyshop
Want to have our Colorado fly fishing guides show you the best fishing spots or maybe you want to take your family on a Rocky Mountain National Park tour? Book a guided Estes Park fly fishing trip with Kirks Flyshop and we’ll show you the way. Our experienced local guides know where the fish are biting, what flies are working, and how to make your day on the water unforgettable.
Whether you’re new to fly fishing or looking to explore hard-to-reach waters, we’ll handle the gear, logistics, and permits— so you can focus on the fish.
Book your guided fly fishing trip with Kirks Flyshop!
From novices to seasoned anglers, we take guests of all skill levels and walks of life on our Big Thompson River fly fishing trips. Join us for a bucket list angling adventure and reserve your guide today.
FAQ: Fly Fishing for Cutthroat Trout in Colorado
Can you keep cutthroat trout in RMNP?
Most areas require catch-and-release for cutthroat trout, especially native populations. Always check local regulations.
How do I identify a cutthroat trout?
Look for the signature red or orange slash under the jaw. Body color ranges from golden to greenish with sparse spotting.
Are there different types of cutthroat trout in Colorado?
Yes! Colorado is home to Greenback, Colorado River, and Rio Grande cutthroat trout.
Do cutthroat trout eat dry flies?
Absolutely! They’re known for aggressive rises, especially in the high country.
What makes cutthroat trout hard to catch?
They can be spooky in clear water and are often found in remote areas, but that’s what makes landing one so rewarding.
Ready to Fish for Colorado’s Native Trout?
Fly fishing for cutthroat trout in Rocky Mountain National Park is more than just a bucket list experience— it’s a connection to Colorado’s wild heritage. With the right gear, the right flies, and a bit of local know-how, you’re well on your way to a memorable day on the water.
Let Kirks Flyshop help you make the most of your time in RMNP. 👉 Book a Guided Fly Fishing Trip