Westminster, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Westminster, a city in Adams County, Colorado.
This Afternoon
83°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 83, with temperatures falling to around 75 in the afternoon. Northwest wind around 7 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Westminster
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 83°F | Chance Showers And Thunderstorms | 7 mph NW | 46% |
| Tonight | 55°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 to 7 mph W | 37% |
| Saturday | 76°F | Partly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph N | 66% |
| Saturday Night | 52°F | Chance Showers And Thunderstorms | 1 to 6 mph WNW | 52% |
| Sunday | 71°F | Showers And Thunderstorms Likely | 1 to 6 mph NNE | 55% |
| Sunday Night | 50°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 34% |
| Monday | 73°F | Sunny | 0 to 6 mph ENE | 2% |
| Monday Night | 52°F | Mostly Clear | 1 to 6 mph N | 12% |
| Tuesday | 76°F | Mostly Sunny | 1 to 5 mph NNE | 12% |
| Tuesday Night | 54°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph SW | 18% |
| Wednesday | 77°F | Partly Sunny | 1 to 5 mph NE | 14% |
| Wednesday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 3 mph SW | 17% |
| Thursday | 77°F | Mostly Sunny | 5 mph NNE | 13% |
| Thursday Night | 55°F | Chance Rain Showers then Mostly Cloudy | 1 to 5 mph SSW | 30% |
Forecast source: National Weather Service (api.weather.gov) for Westminster (39.880, -105.062). Updated through the day.
Growing snapshot for Westminster
Last spring frost
May 2
First fall frost
Oct 11
Growing season
160 days
Hardiness zone
6a
More local growing data for Westminster: nearby ZIP 80031 weather · frost dates · planting calendar · Colorado frost dates
Nearby towns & communities
Bennett
Berkley
Brighton
Byers
Comanche Creek
Commerce City
Derby
Federal Heights
Lochbuie
Northglenn
Peoria
Shaw Heights
Sherrelwood
Strasburg
Thornton
Todd Creek
Twin Lakes
Welby
Climate data from the nearest NOAA station, Northglenn, Co (2.2 mi from Westminster). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.