Firestone, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Firestone, a town in Weld County, Colorado.
Tonight
54°F
Chance Showers And Thunderstorms then Mostly Cloudy
A chance of showers and thunderstorms before 8pm, then a slight chance of showers and thunderstorms between 8pm and 9pm. Mostly cloudy, with a low around 54. West wind 2 to 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Firestone
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Chance Showers And Thunderstorms then Mostly Cloudy | 2 to 7 mph W | 32% |
| Saturday | 77°F | Partly Sunny then Chance Showers And Thunderstorms | 1 to 7 mph SE | 72% |
| Saturday Night | 50°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 1 to 5 mph W | 56% |
| Sunday | 72°F | Showers And Thunderstorms Likely | 1 to 6 mph NE | 55% |
| Sunday Night | 47°F | Chance Rain Showers then Partly Cloudy | 0 to 5 mph E | 32% |
| Monday | 73°F | Mostly Sunny | 0 to 6 mph ENE | 2% |
| Monday Night | 49°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 to 6 mph NNE | 17% |
| Tuesday | 77°F | Mostly Sunny | 5 mph NNE | 9% |
| Tuesday Night | 51°F | Chance Showers And Thunderstorms then Mostly Cloudy | 5 mph SSW | 25% |
| Wednesday | 78°F | Partly Sunny | 6 mph NE | 8% |
| Wednesday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 3 mph WSW | 17% |
| Thursday | 79°F | Mostly Sunny | 1 to 6 mph NNE | 10% |
| Thursday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 1 to 5 mph S | 23% |
| Friday | 80°F | Mostly Sunny | 1 to 6 mph ENE | 13% |
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 Sep 19, 2026.