Fairmount, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fairmount, a community in Jefferson County, Colorado.
This Afternoon
55°F
Mostly Cloudy
Mostly cloudy. High near 55, with temperatures falling to around 51 in the afternoon. Northeast wind around 6 mph.
7-day forecast for Fairmount
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 55°F | Mostly Cloudy | 6 mph NE | 10% |
| Tonight | 35°F | Mostly Cloudy | 5 mph NNW | 10% |
| Thursday | 57°F | Sunny | 2 to 6 mph SSE | 0% |
| Thursday Night | 34°F | Mostly Cloudy | 3 mph WSW | 0% |
| Friday | 55°F | Mostly Sunny | 1 to 5 mph N | 10% |
| Friday Night | 34°F | Mostly Clear | 6 mph W | 10% |
| Saturday | 59°F | Sunny | 2 to 8 mph NE | 0% |
| Saturday Night | 34°F | Mostly Clear | 3 mph WNW | 0% |
| Sunday | 64°F | Sunny | 2 to 8 mph SSW | 0% |
| Sunday Night | 40°F | Clear | 5 to 10 mph W | 0% |
| Monday | 66°F | Sunny | 2 to 9 mph ENE | 0% |
| Monday Night | 39°F | Mostly Clear | 3 mph WNW | 0% |
| Tuesday | 63°F | Mostly Sunny | 3 mph NNE | 1% |
| Tuesday Night | 40°F | Partly Cloudy | 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Fairmount (39.793, -105.171). Updated through the day.
Growing snapshot for Fairmount
Last spring frost
May 5
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
6a
More local growing data for Fairmount: nearby ZIP 80004 weather · frost dates · planting calendar · Colorado frost dates
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Wheat Ridge
Climate data from the nearest NOAA station, Wheat Ridge 2, Co (2.7 mi from Fairmount). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.