Which flies do I bring to CO ?

Depends on where you are heading and what youre fishing for. Pmd’s , Caddis,BWO , Stimulators Adam’s will cover dries. Maybe some hoppers but still a little early.
PT, Hares ears, Barr Emergers, for nymphs. Golden Tungstones and Turds black, sizes 14-10
Midges in 18 & 20. Zebras in black and red, mercury midge black and red, TopSecret in brown and black.
Should cover about anywhere.
THIS... good information..better than what i said.. i forgot about the midges. especially if you get into some of those lakes that have huge cut's in them. its always crazy how a 5 lb fish can survive on the tiniest of organisms.
 
If you want to blow & go, a spinner is hard to beat.
Gold Little Cleo
Rapala Sinking CD01S or CD03S (1 or 1.5 inch versions)
My elderly mother uses those and tears em up. Hard to fish water she's been thru.

I doubt there is a trout in the world that will pass up an Adams in 12-14, gold ribbed hairs ear 10-14, or wooly bugger in various colors & sizes.

Have a great time!

I'd love to fish some high alpine lakes.
 
You may want to try some lakes as well. Sometimes hatches vary from one lake to the next. There are gorgeous high alpine lakes as well as large reservoirs in South Park and North Park that have pretty darn big trout. Sometimes a float tube or kayak help a lot though.
 
It’s always nice to have a fly rod with you when out there in the fall :). These made a great addition to our mountain house meals
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Barr’s graphic caddis is a great one this time of year. I would also have PMD’s, Green Drakes and some size 20-24 BWO’s. Midges are always a possibility too. If you’re flying through Denver, I would suggest stopping by Blue Quill Angler or Charlie’s Fly Box on your way out of town. Both are great shops that tend to be on top of fishing conditions.
 
My go to flies are a yellow or orange Stimulator, BWO, Parachute Adams, Chubby Chernobyl. Throw a Pheasant Tail, Copper John or similar off the back...maybe a lightning bug.

Last year this time of year I fished a solid week in MT all over, and a few days in CO mostly the Arkansas and Rio. All four of the dries above produced (Stimulator #1) and a good old Copper John was the best dropper.
 
someone can correct me if i am wrong, but a person cannot use a dropper fly in some states or some bodies of water. It sounds like I wont have that issue in CO? or are some streams and rivers different? I havent looked at the regs yet.
 
If your fishing high country streams or small lakes those fish aren't too picky. Elk hair caddis, hoppers, Royal Wullfs, S&H Variant, Adams parachutes, etc..,attractors all in size 12-16 for dries. For nymphs, pheasant tail, bead head prince, hare's ears (size 14). If your fishing a small alpine lake a wooley bugger in olive or black might come in handy too. If you get down to the bigger rivers then you might want to have some midge patterns and small baetis patterns with you like a Zebra midge or a small pheasant tails (size 18-22).
 
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Great post, I will be hunting a ranch in Hamilton, CO the first permit elk season, the Williams Fork runs thru the ranch, any suggestions? thanks and good luck.
 
If you are hitting mountain streams, an ant and royal Wolff will do it. If you are hitting some of our tail water and rivers that use more technical approach’s. A RS-2 behind an attractor nymph works all year. If they aren’t taking it. Size down until they do
 
Anything that looks like a moth. My god do we have moths this year. Elk hair caddis should do the trick. I use renegades as a go-to in CO when I’m not sure. Don’t over think it, fish aren’t as smart as they are given credit for. If they’re rising I can catch them on a cotton ball wrapped around a hook


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Lots of good advice here. Gun-to-my-head, have-to-catch-a-trout-right-now-to-save-my-life, I would want 5 patterns in my box: size 8 black beadhead wooly bugger, size 12 beadhead prince nymph, size 14 pheasant tail nymph, size 16 elk hair caddis, size 4 stimulator.
 
Great post, I will be hunting a ranch in Hamilton, CO the first permit elk season, the Williams Fork runs thru the ranch, any suggestions? thanks and good luck.

That is a different Williams Fork than 99.9% of folks think of associated with that name. So, you won't find much of anything on the googles. Pheasant tails and hares ears dropped below a stimulator or amy's ant if it hasn't snowed.
 
Anything that looks like a moth. My god do we have moths this year. Elk hair caddis should do the trick. I use renegades as a go-to in CO when I’m not sure. Don’t over think it, fish aren’t as smart as they are given credit for. If they’re rising I can catch them on a cotton ball wrapped around a hook


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I know some trout that would make this post look stupid ;)

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