Forecast Location
Daily River Forecast
Yellowstone River
Paradise Valley, Montana
Updated for April 30, 2026
Top Summary
Fish the softer banks, side channels, and gravel transitions with stoneflies, worms, and baetis nymphs until you see consistent heads. If cloud cover holds, keep a BWO dry ready for the slower edges and foam lines in the afternoon.
Current Conditions
- Flow: Mainstem volume is higher than the trout rivers around it, but side channels and softer inside bends stay very workable in spring.
- Water Temperature: Water is still cold enough that feeding windows tighten around the warmest part of the day.
- Weather: Wind changes the whole river. Stable clouds are better than bright sun or hard gusts.
- Overall Rating: 6/10
What's Happening Right Now
Yellowstone fish are spread out more than they are on the smaller spring creeks and tailwaters, so the game is finding softer holding water inside a big river. Browns and rainbows sit on current breaks off the main push and slide shallow when baetis start drifting. They are rarely as selective here as they are on the Missouri or Bighorn, but they do want flies near the bottom before the hatch gets going.
What's Hatching
- Blue-winged olives, size 18-20, midday to afternoon
- Midges, size 18-22, sheltered water in the morning
- March Browns, size 12-14, sporadic midday in softer runs
Best Flies To Use
- Pat's Rubber Legs, size 6-8, nymph
- Worm pattern red or pink, size 8-12, nymph
- Lightning Bug, size 16-18, nymph
- Pheasant Tail, size 16-18, nymph
- Parachute BWO, size 18-20, dry
- March Brown Cripple, size 12-14, dry
How To Fish It
- Cover inside bends, seams behind gravel bars, and the slow edge beside heavier center-river current.
- A bigger lead fly with a smaller mayfly trailer is the simplest way to find fish before surface activity starts.
- If bugs appear, move to protected slicks and side channels where trout can rise without fighting the main current.
More On This River
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About The Yellowstone River
The Yellowstone is the longest undammed river in the lower forty-eight and the heart of Montana float-fishing culture through Paradise Valley. It is broad, mobile, and changes with every weather push, which is why reading current speed is more important here than reading a single seam.
Wild rainbow, brown, and cutthroat trout are the main draw. The river is famous for streamer eats, hopper season, and strong mayfly windows, but spring fishing often comes down to disciplined nymphing mixed with opportunistic dry-fly shots.
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