Northglenn, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Northglenn, 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 between a tenth and quarter of an inch possible.
7-day forecast for Northglenn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 83°F | Chance Showers And Thunderstorms | 7 mph NW | 46% |
| Tonight | 57°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 to 7 mph WSW | 37% |
| Saturday | 75°F | Partly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph N | 68% |
| Saturday Night | 53°F | Chance Showers And Thunderstorms | 2 to 6 mph WNW | 54% |
| Sunday | 71°F | Showers And Thunderstorms Likely | 2 to 7 mph NE | 56% |
| Sunday Night | 51°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 6 mph SE | 34% |
| Monday | 74°F | Mostly Sunny | 1 to 7 mph NE | 2% |
| Monday Night | 53°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 to 7 mph SSW | 15% |
| Tuesday | 76°F | Mostly Sunny | 2 to 6 mph NNE | 11% |
| Tuesday Night | 55°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 to 6 mph SSW | 18% |
| Wednesday | 77°F | Partly Sunny | 2 to 6 mph NNE | 12% |
| Wednesday Night | 55°F | Slight Chance Rain Showers then Mostly Cloudy | 5 mph SW | 17% |
| Thursday | 78°F | Mostly Sunny | 2 to 6 mph N | 11% |
| Thursday Night | 56°F | Chance Rain Showers then Mostly Cloudy | 2 to 6 mph S | 29% |
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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Federal Heights
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Sherrelwood
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Thornton
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Twin Lakes
Welby
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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 Sep 19, 2026.