Fort Lupton, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fort Lupton, a city in Weld County, Colorado.
Tonight
51°F
Chance Showers And Thunderstorms then Partly Cloudy
A chance of showers and thunderstorms before 9pm. Partly cloudy. Low around 51, with temperatures rising to around 54 overnight. South wind 1 to 6 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Fort Lupton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 6 mph S | 44% |
| Sunday | 70°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 2 to 8 mph NNE | 32% |
| Sunday Night | 49°F | Slight Chance Rain Showers then Partly Cloudy | 1 to 8 mph N | 22% |
| Monday | 73°F | Sunny | 1 to 10 mph NE | 1% |
| Monday Night | 50°F | Partly Cloudy | 2 to 10 mph SSE | 6% |
| Tuesday | 79°F | Mostly Sunny | 2 to 7 mph NW | 2% |
| Tuesday Night | 53°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 to 8 mph S | 15% |
| Wednesday | 80°F | Partly Sunny | 2 to 6 mph N | 2% |
| Wednesday Night | 53°F | Mostly Cloudy | 2 to 6 mph SW | 11% |
| Thursday | 82°F | Mostly Sunny | 2 to 9 mph NE | 3% |
| Thursday Night | 56°F | Mostly Cloudy | 2 to 9 mph SSE | 7% |
| Friday | 81°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 9 mph S | 21% |
| Friday Night | 55°F | Chance Rain Showers then Partly Cloudy | 3 to 9 mph S | 26% |
| Saturday | 82°F | Mostly Sunny then Slight Chance Rain Showers | 2 to 7 mph SE | 17% |
Forecast source: National Weather Service (api.weather.gov) for Fort Lupton (40.083, -104.806). Updated through the day.
Growing snapshot for Fort Lupton
Last spring frost
May 3
First fall frost
Oct 7
Growing season
155 days
Hardiness zone
5b
More local growing data for Fort Lupton: nearby ZIP 80621 weather · frost dates · planting calendar · Colorado frost dates
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Climate data from the nearest NOAA station, Brighton 3 Se, Co (11.5 mi from Fort Lupton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.