Firestone, CO Weather & Growing Conditions
Today
76°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms between noon and 3pm, then showers and thunderstorms likely. Mostly sunny. High near 76, with temperatures falling to around 70 in the afternoon. East northeast wind 2 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 8 mph ENE | 63% |
| Tonight | 51°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 to 7 mph SSE | 40% |
| Sunday | 71°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 7 mph NE | 29% |
| Sunday Night | 49°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 7 mph NNE | 30% |
| Monday | 73°F | Mostly Sunny | 1 to 8 mph NNE | 1% |
| Monday Night | 50°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 to 8 mph ESE | 23% |
| Tuesday | 75°F | Mostly Sunny | 5 mph NNE | 4% |
| Tuesday Night | 52°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 6 mph SSW | 18% |
| Wednesday | 78°F | Mostly Sunny | 2 to 6 mph NE | 7% |
| Wednesday Night | 52°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 2 to 6 mph NW | 15% |
| Thursday | 79°F | Mostly Sunny | 2 to 7 mph N | 5% |
| Thursday Night | 54°F | Partly Cloudy | 2 to 7 mph SSW | 12% |
| Friday | 80°F | Mostly Sunny | 1 to 7 mph SSE | 9% |
| Friday Night | 54°F | Slight Chance Rain Showers then Partly Cloudy | 6 mph S | 15% |
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 (8.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.