Firestone, CO Weather & Growing Conditions
Today
78°F
Patchy Smoke
Patchy smoke. Mostly sunny, with a high near 78. East wind 6 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Patchy Smoke | 6 to 9 mph E | 11% |
| Tonight | 55°F | Patchy Smoke | 6 to 10 mph NE | 8% |
| Wednesday | 86°F | Patchy Smoke | 5 to 10 mph ENE | 0% |
| Wednesday Night | 57°F | Mostly Clear | 3 to 9 mph NNE | 1% |
| Thursday | 96°F | Sunny | 2 to 8 mph NW | 0% |
| Thursday Night | 60°F | Mostly Clear | 7 mph NNW | 1% |
| Friday | 98°F | Sunny | 1 to 8 mph S | 0% |
| Friday Night | 62°F | Mostly Clear | 7 mph SSW | 0% |
| Saturday | 100°F | Sunny | 2 to 8 mph NE | 2% |
| Saturday Night | 63°F | Partly Cloudy | 3 to 8 mph WNW | 1% |
| Sunday | 99°F | Sunny | 2 to 9 mph NNE | 7% |
| Sunday Night | 65°F | Partly Cloudy | 5 to 9 mph WNW | 5% |
| Monday | 98°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 10 mph N | 18% |
| Monday Night | 65°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 3 to 12 mph W | 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 (2.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.