Firestone, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Firestone, a town in Weld County, Colorado.
This Afternoon
58°F
Sunny
Sunny. High near 58, with temperatures falling to around 53 in the afternoon. East northeast wind around 5 mph.
7-day forecast for Firestone
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 58°F | Sunny | 5 mph ENE | 0% |
| Tonight | 34°F | Mostly Clear | 3 mph S | 0% |
| Wednesday | 56°F | Mostly Sunny | 3 mph NNE | 4% |
| Wednesday Night | 35°F | Mostly Cloudy | 3 mph NW | 4% |
| Thursday | 59°F | Sunny | 3 mph SSE | 0% |
| Thursday Night | 34°F | Partly Cloudy | 2 mph WSW | 1% |
| Friday | 58°F | Mostly Sunny | 1 to 5 mph ENE | 5% |
| Friday Night | 34°F | Mostly Clear | 2 mph SW | 5% |
| Saturday | 60°F | Sunny | 1 to 5 mph S | 0% |
| Saturday Night | 33°F | Mostly Clear | 2 mph SW | 0% |
| Sunday | 66°F | Sunny | 3 mph S | 0% |
| Sunday Night | 37°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 65°F | Sunny | 5 mph SSE | 0% |
| Monday Night | 38°F | Partly Cloudy | 2 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Firestone (40.156, -104.949). Updated through the day.
Growing snapshot for Firestone
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
5b
More local growing data for Firestone: nearby ZIP 80520 weather · frost dates · planting calendar · Colorado frost dates
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Climate data from the nearest NOAA station, Longmont 2 Ese, Co (8.5 mi from Firestone). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.