Niwot, CO Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Niwot, a community in Boulder County, Colorado.

Overnight

58°F

Patchy Smoke

Patchy smoke. Mostly cloudy. Low around 58, with temperatures rising to around 60 overnight. North northeast wind around 9 mph.

7-day forecast for Niwot

When	Temp	Forecast	Wind	Precip
Overnight	58°F	Patchy Smoke	9 mph NNE	14%
Tuesday	78°F	Patchy Smoke	5 to 8 mph ENE	16%
Tuesday Night	53°F	Patchy Smoke	3 to 8 mph NNE	10%
Wednesday	86°F	Patchy Smoke	3 to 7 mph NE	1%
Wednesday Night	56°F	Mostly Clear	2 to 7 mph N	1%
Thursday	95°F	Sunny	2 to 7 mph NNE	1%
Thursday Night	59°F	Clear	6 mph NW	1%
Friday	98°F	Sunny	2 to 8 mph S	0%
Friday Night	62°F	Mostly Clear	7 mph WSW	0%
Saturday	100°F	Sunny	2 to 7 mph NNE	3%
Saturday Night	63°F	Partly Cloudy	3 to 7 mph WNW	0%
Sunday	99°F	Sunny	3 to 8 mph NE	8%
Sunday Night	65°F	Partly Cloudy	8 mph WNW	4%
Monday	97°F	Mostly Sunny then Chance Showers And Thunderstorms	6 to 10 mph N	26%

Forecast source: National Weather Service (api.weather.gov) for Niwot (40.098, -105.158). Updated through the day.

Growing snapshot for Niwot

Last spring frost

May 7

First fall frost

Oct 5

Growing season

151 days

More local growing data for Niwot: nearby ZIP 80544 weather · frost dates · planting calendar · Colorado frost dates

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All Colorado locations ›

Climate data from the nearest NOAA station, Longmont 2 Ese, Co (6.8 mi from Niwot). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.