Firestone, CO Weather & Growing Conditions
Today
79°F
Patchy Smoke
Patchy smoke. Mostly sunny. High near 79, with temperatures falling to around 77 in the afternoon. East wind 7 to 10 mph, with gusts as high as 16 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Patchy Smoke | 7 to 10 mph E | 8% |
| Tonight | 55°F | Patchy Smoke | 6 to 12 mph NE | 9% |
| Wednesday | 86°F | Patchy Smoke then Sunny | 6 to 10 mph NE | 0% |
| Wednesday Night | 58°F | Mostly Clear | 5 to 10 mph NE | 1% |
| Thursday | 96°F | Sunny | 2 to 8 mph N | 0% |
| Thursday Night | 61°F | Mostly Clear | 7 mph SW | 1% |
| Friday | 99°F | Sunny | 2 to 8 mph S | 0% |
| Friday Night | 64°F | Mostly Clear | 8 mph S | 0% |
| Saturday | 101°F | Sunny | 2 to 8 mph N | 1% |
| Saturday Night | 64°F | Partly Cloudy | 5 to 9 mph W | 1% |
| Sunday | 100°F | Sunny | 3 to 9 mph N | 6% |
| Sunday Night | 65°F | Partly Cloudy | 5 to 9 mph W | 5% |
| Monday | 99°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph N | 16% |
| Monday Night | 64°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 12 mph WNW | 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 Aug 4, 2026.