Morrison, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Morrison, a town in Jefferson County, Colorado.
Today
72°F
Patchy Smoke
Patchy smoke before noon, then patchy smoke and a chance of showers and thunderstorms. Partly sunny, with a high near 72. East northeast wind around 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Morrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Patchy Smoke | 7 mph ENE | 32% |
| Tonight | 54°F | Patchy Smoke | 3 to 7 mph NNW | 13% |
| Wednesday | 79°F | Patchy Smoke then Sunny | 3 to 8 mph NE | 0% |
| Wednesday Night | 56°F | Mostly Clear | 3 to 8 mph NNE | 2% |
| Thursday | 87°F | Sunny | 3 to 9 mph N | 1% |
| Thursday Night | 60°F | Mostly Clear | 6 to 9 mph SW | 2% |
| Friday | 88°F | Sunny | 6 to 10 mph N | 1% |
| Friday Night | 64°F | Mostly Clear | 6 to 12 mph S | 1% |
| Saturday | 90°F | Sunny | 7 to 12 mph N | 2% |
| Saturday Night | 65°F | Partly Cloudy | 9 mph SSE | 1% |
| Sunday | 90°F | Sunny | 9 mph NE | 13% |
| Sunday Night | 66°F | Partly Cloudy | 8 mph WNW | 2% |
| Monday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 9 mph NNW | 25% |
| Monday Night | 64°F | Mostly Cloudy | 6 to 9 mph WNW | 14% |
Forecast source: National Weather Service (api.weather.gov) for Morrison (39.636, -105.206). Updated through the day.
Growing snapshot for Morrison
Last spring frost
May 23
First fall frost
Sep 22
Growing season
118 days
Hardiness zone
5b
More local growing data for Morrison: nearby ZIP 80465 weather · frost dates · planting calendar · Colorado frost dates
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Climate data from the nearest NOAA station, Evergreen, Co (6.2 mi from Morrison). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.