Fishing forecast for Denver, CO

Denver fishes at a mile of elevation, and the altitude changes the arithmetic. Chatfield and Cherry Creek are warm-water reservoirs on the plains edge; the South Platte through town is a tailwater; and within an hour west the water is high-country trout that stays cold all summer. Three fisheries, three different seasonal clocks.

Best fishing times in Denver this week

Majors run an hour either side of the moon crossing the meridian over Denver, CO; minors, half an hour either side of moonrise and moonset. Where those widths come from: the solunar calendar and best fishing times.

When these windows are not the right tool

Solunar theory is John Alden Knight's 1926 prediction; the ±60 and ±30 minute widths are convention, not calculation. The times are computed astronomy, the claim that fish feed inside them is not. The day rating follows moon phase — identical nationwide, so every city shows it the same. A moving front beats the moon: apps that read pressure.

Where to fish in Denver

This page is built around Chatfield, with Cherry Creek and South Platte in reach — fresh water, about 30 minutes from the middle of Denver.

Chatfield and Cherry Creek are both plains reservoirs half an hour from downtown, and they hold walleye, smallmouth and catfish rather than the trout most people associate with Colorado. The trout water is upstream and uphill.

Brown trout spawn in autumn and become aggressive and territorial from September into November, which makes autumn — not spring — the trophy window on the Front Range rivers.

Chatfield and Cherry Creek were both built as flood-control reservoirs after a destructive South Platte flood, and their levels are managed for that purpose first. Recreation is a secondary use written into the operating rules.

Waterton Canyon at the southwest edge of the metro is a Denver Water service road closed to cars, so the roughly six miles of South Platte between the canyon mouth and Strontia Springs Dam are walk-in or bike-in only. Dogs are kept out of the whole canyon to protect a resident bighorn herd.

Most of the high-country water sits along one road, I-70, and that road rather than the mileage sets the shape of the day. The Idaho Springs and Georgetown stretch runs heavy westbound in the morning and eastbound in the afternoon on weekends in every season — much of why the plains reservoirs keep their regulars.

The nearest grids we publish are Wichita, KS (701 km, Cheney Reservoir) and Phoenix, AZ (942 km, Lake Pleasant). Different water, and different minutes.

What you can catch in Denver

State listings put these 5 fish in the water around Denver. Plan around the peak, not the open season.

The South Platte through Denver is a tailwater below Chatfield, which means it runs cold and at a controlled flow year round. It fishes in January when the reservoirs are locked up, and it is the reason this city has a genuine winter fishery.

The air at this elevation is thin and dry, and clear nights radiate heat fast. Water in shallow plains reservoirs can drop several degrees overnight in spring and autumn, which delays the morning bite compared with the same latitude at sea level.

Kokanee and lake trout live in reservoirs an hour west at altitudes above eight thousand feet, where ice comes in November and stays into May. Two hours of driving from downtown changes the season by two months.

The cutthroat native to this drainage is the greenback, Colorado's state fish, and it was twice thought extinct. Genetic work in 2012 identified the only pure lineage in one small creek near Colorado Springs, and fry from that stock were confirmed reproducing on their own in Herman Gulch, west of the city, in 2022.

Whirling disease reached Colorado hatcheries in the late 1980s and ended wild rainbow reproduction across most of the state within a decade. Rainbows stocked into this drainage descend from a resistant German hatchery strain crossed with wild Colorado fish, a breeding program the state has run since about 2004. Brown trout, which the parasite barely touches, carried the wild reproduction through those years.

Tackle sits outside a forecast page: start with how to catch smallmouth bass.

Water temperature and season in Denver

Air here swings 43.0 °F across the year, from 31.8 °F in December to 74.8 °F in July, and December averages below freezing. No gauge measures water temperature here, so the table below is air only.

The water here is never measured, only the air above it, whose daily swing is the widest in this grid — the normal January afternoon runs well above freezing while the night sits far below. A mean describes the season, never the day. CPW asks anglers off trout water at seventy degrees, and a shallow plains reservoir can cross that line by afternoon and lose it overnight.

Sunrise, sunset and daylight in Denver

The moon window moves daily; the sun does not. Plan a season against this block.

The longest day of 2026 is June 21, 14h 59m; the shortest, December 21, 9h 21m. The meridian passing drifts 48 minutes later daily: a dawn window this week is an afternoon window in a fortnight.

Runoff is the dominant seasonal event, not spring warming. Snowmelt colors and swells the rivers from roughly May into early July, and mountain water is often unfishable at exactly the time the calendar says it should be best.

Walleye spawn early on the reservoirs, usually April, and the state runs a spawn-take operation on Chatfield most years. That is the practical top of the walleye calendar here, well before the summer crowds arrive.

Hard water on the plains reservoirs runs from roughly December into March — three months, against six on the lakes above eight thousand feet an hour west. Elevation buys a longer ice season here, not a shorter one.

The sunrise and sunset in the table assume a flat horizon. Denver's eastern horizon is flat plains, so mornings run close to the minute, but the Front Range stands directly west and takes the sun a few minutes early downtown — and much earlier than that in Waterton or Clear Creek Canyon, where the wall shades the water while the sky is still bright.

From July into September moist southern air builds thunderstorms over the foothills first and drives them onto the plains, and on an active day the cells fire between roughly one and seven in the afternoon. That leaves the evening major period on mountain water under the least dependable sky of the year, while the plains reservoirs mostly get the same storms as wind.

License and seasons in Colorado

Rules for Colorado come from the Colorado agency, and the calculation behind the table is set out in how we compute these times.