Firestone, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Firestone, a town in Weld County, Colorado.
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 for Firestone
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Patchy Smoke | 7 to 10 mph E | 9% |
| Tonight | 55°F | Patchy Smoke | 6 to 10 mph NE | 8% |
| Wednesday | 87°F | Patchy Smoke then Sunny | 6 to 10 mph NE | 0% |
| Wednesday Night | 57°F | Mostly Clear | 3 to 10 mph NNE | 1% |
| Thursday | 96°F | Sunny | 2 to 8 mph NNW | 0% |
| Thursday Night | 60°F | Mostly Clear | 7 mph NE | 1% |
| Friday | 99°F | Sunny | 2 to 7 mph SSE | 0% |
| Friday Night | 62°F | Mostly Clear | 7 mph S | 0% |
| Saturday | 101°F | Sunny | 2 to 8 mph N | 2% |
| Saturday Night | 63°F | Partly Cloudy | 5 to 8 mph W | 1% |
| Sunday | 101°F | Sunny | 2 to 9 mph NNE | 7% |
| Sunday Night | 64°F | Partly Cloudy | 3 to 9 mph WNW | 5% |
| Monday | 99°F | Sunny then Slight Chance Showers And Thunderstorms | 3 to 10 mph N | 16% |
| Monday Night | 64°F | Mostly Cloudy | 3 to 12 mph W | 14% |
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
Nearby towns & communities
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Ault
Berthoud
Briggsdale
Dacono
Eaton
Erie
Evans
Fort Lupton
Frederick
Garden City
Gilcrest
Greeley
Grover
Hudson
Johnstown
Keenesburg
Kersey
La Salle
Mead
Milliken
Nunn
Orchard
Pierce
Platteville
Raymer (New Raymer)
Severance
Windsor
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 Aug 4, 2026.