Post-runoff window opens on the Colorado River as green drakes approach

What's biting

What's next

The coming days favor anglers who commit to early starts. With the Colorado River at 71°F on June 22, midday water temperatures will climb as summer heat builds — trout metabolism is active but thermal stress is real. Fish aggressively through the first few hours of morning light, then consider pulling off the water by late morning unless you can find cold tributary mouths or deep shaded runs that offer thermal refuge.

Green drakes are the most anticipated development on the near horizon. Crystal Fly Shop (CO) flags the emergence arriving within two weeks — their Colorado River report calls them 'right on the horizon' while the Roaring Fork report echoes the same timing. When they come on, large olive dries and green drake nymphs fished through fast riffles and softer inside seams should be the first pick in your box.

In the meantime, Crystal Fly Shop's Roaring Fork report confirms that nymphing has been 'solid using Rubberleg Stones and green drake imitations' — subsurface fish are already keying on pre-emergence nymphs. Golden stones, PMDs, and caddis are also in the mix, giving nymphers a full selection to work through. Rig a two-nymph setup: a heavy stonefly pattern up top and a smaller PMD or drake nymph on the dropper. Large attractor dry flies are producing results in the still-elevated flows; take advantage of this forgiving window before water drops further and fish turn pressure-selective.

For the Arkansas River, Cutthroat Anglers (CO) describes the 2026 season as one where fish are 'active, grouped up, and ready to bite for the angler willing to hike a little further or cast a little lighter.' Similar hatch timing applies — caddis and PMDs lead, with larger attractor patterns effective through pocketwater. Weekend anglers should carry 5X–6X tippet as water clarity continues to improve, and plan around that morning window. At 71°F, fish quickly and release carefully; recovery time after the fight matters.

Context

The 2026 season on Colorado's river systems is tracking significantly below historical norms by one key measure: snowpack. Cutthroat Anglers (CO) stated plainly in their May update that 'this winter has been historic for all the wrong reasons,' and that reality has shaped everything from runoff timing to summer flow expectations. With Western snowpacks at historic lows, rivers hit fishable conditions earlier than usual but also face a compressed prime-fishing window before summer heat takes hold.

Historically, the Colorado River's peak runoff crests in late May through early June, with flows settling into prime trout-fishing range through late June and early July. This year, the early flush means late June already feels more mid-summer than post-runoff transition — hence the 71°F reading on June 22, a temperature that in normal high-snowpack seasons might not arrive until mid-July. Crystal Fly Shop's Colorado River report acknowledges this directly, urging anglers to act 'before the heat kicks in and the fishing tapers off with our paltry runoff.'

Hatch Magazine's guide to trout fishing through drought speaks to this pattern: 'On Colorado's Front Range, essentially a high desert, longtime trout anglers tend to be more tuned into the realities of drought, low water, and rising temperatures.' The 2026 season is running compressed and warm — fish earlier in the day, target deeper water, and expect the prime terrestrial window (hoppers, ants, beetles) to arrive ahead of its typical July schedule.

There is a genuine silver lining: low-water years concentrate fish in the best lies, making location more predictable. Access has also improved this season — MidCurrent reports a landmark Colorado acquisition at Tolland Ranch that opens miles of previously private water to fly anglers. On balance, the late-June window is narrower than in a high-snowpack year, but the fish are active and feeding. The time to go is now.