Northglenn, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Northglenn, a city in Adams County, Colorado.
This Afternoon
56°F
Sunny
Sunny. High near 56, with temperatures falling to around 53 in the afternoon. East northeast wind around 3 mph.
7-day forecast for Northglenn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Sunny | 3 mph ENE | 0% |
| Tonight | 36°F | Mostly Clear | 3 mph SSE | 0% |
| Wednesday | 55°F | Mostly Sunny | 5 mph N | 9% |
| Wednesday Night | 37°F | Mostly Cloudy | 5 mph NW | 8% |
| Thursday | 57°F | Sunny | 5 mph S | 0% |
| Thursday Night | 36°F | Partly Cloudy | 3 mph SW | 1% |
| Friday | 56°F | Mostly Sunny | 5 mph NNE | 7% |
| Friday Night | 36°F | Mostly Clear | 3 mph SW | 7% |
| Saturday | 59°F | Sunny | 5 mph SSE | 1% |
| Saturday Night | 35°F | Mostly Clear | 5 mph WSW | 0% |
| Sunday | 66°F | Sunny | 2 to 6 mph S | 0% |
| Sunday Night | 41°F | Mostly Clear | 2 to 6 mph WSW | 0% |
| Monday | 65°F | Sunny | 5 mph SE | 0% |
| Monday Night | 40°F | Partly Cloudy | 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Northglenn (39.912, -104.982). Updated through the day.
Growing snapshot for Northglenn
Last spring frost
May 2
First fall frost
Oct 11
Growing season
160 days
Hardiness zone
6a
More local growing data for Northglenn: nearby ZIP 80234 weather · frost dates · planting calendar · Colorado frost dates
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Thornton
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Climate data from the nearest NOAA station, Northglenn, Co (1 mi from Northglenn). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.