Northglenn, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Northglenn, a city in Adams County, Colorado.
Today
79°F
Patchy Smoke
Patchy smoke. Mostly sunny. High near 79, with temperatures falling to around 77 in the afternoon. East northeast wind 6 to 9 mph.
7-day forecast for Northglenn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Patchy Smoke | 6 to 9 mph ENE | 14% |
| Tonight | 58°F | Patchy Smoke | 5 to 9 mph NNE | 11% |
| Wednesday | 86°F | Patchy Smoke | 5 to 9 mph NNE | 0% |
| Wednesday Night | 62°F | Mostly Clear | 3 to 9 mph SSW | 2% |
| Thursday | 95°F | Sunny | 2 to 8 mph N | 0% |
| Thursday Night | 64°F | Mostly Clear | 5 to 8 mph SSE | 2% |
| Friday | 97°F | Sunny | 3 to 8 mph S | 0% |
| Friday Night | 68°F | Mostly Clear | 8 mph SSE | 0% |
| Saturday | 99°F | Sunny | 5 to 8 mph N | 1% |
| Saturday Night | 68°F | Partly Cloudy | 5 to 8 mph W | 0% |
| Sunday | 98°F | Sunny | 3 to 8 mph E | 7% |
| Sunday Night | 70°F | Partly Cloudy | 5 to 9 mph WNW | 4% |
| Monday | 97°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph N | 16% |
| Monday Night | 68°F | Partly Cloudy | 3 to 10 mph WNW | 14% |
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
Nearby towns & communities
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Sherrelwood
Strasburg
Thornton
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Twin Lakes
Welby
Westminster
Climate data from the nearest NOAA station, Northglenn, Co (1 mi from Northglenn). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.