Firestone, CO Weather & Growing Conditions
Tonight
53°F
Partly Cloudy
Partly cloudy, with a low around 53. West northwest wind around 5 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Partly Cloudy | 5 mph WNW | 7% |
| Saturday | 76°F | Partly Sunny then Chance Showers And Thunderstorms | 1 to 7 mph WSW | 68% |
| Saturday Night | 50°F | Chance Showers And Thunderstorms | 5 mph WNW | 53% |
| 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 NNE | 31% |
| Monday | 73°F | Mostly Sunny | 0 to 6 mph SE | 2% |
| Monday Night | 49°F | Mostly Clear | 5 mph NNE | 14% |
| Tuesday | 77°F | Mostly Sunny | 1 to 5 mph NNE | 9% |
| Tuesday Night | 51°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph W | 23% |
| Wednesday | 78°F | Partly Sunny | 6 mph NE | 9% |
| Wednesday Night | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 3 mph WSW | 16% |
| Thursday | 79°F | Mostly Sunny | 1 to 6 mph NNE | 11% |
| Thursday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 1 to 5 mph SSW | 22% |
| Friday | 79°F | Mostly Sunny | 1 to 6 mph ENE | 13% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Firestone, CO
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
5b
Explore more for Firestone, CO: full frost dates · planting calendar · Colorado frost dates
Climate data from the nearest NOAA station, Longmont 2 Ese, Co (2.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.