Louisville, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Louisville, a city in Boulder County, Colorado.
Overnight
35°F
Mostly Cloudy
Mostly cloudy, with a low around 35. West southwest wind around 3 mph.
7-day forecast for Louisville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 35°F | Mostly Cloudy | 3 mph WSW | 0% |
| Wednesday | 55°F | Partly Sunny then Slight Chance Rain Showers | 2 to 6 mph NNE | 15% |
| Wednesday Night | 36°F | Slight Chance Rain Showers then Mostly Cloudy | 2 to 6 mph NW | 15% |
| Thursday | 58°F | Sunny | 2 to 6 mph SSE | 0% |
| Thursday Night | 37°F | Partly Cloudy | 3 mph WSW | 1% |
| Friday | 56°F | Mostly Sunny | 5 mph NNE | 13% |
| Friday Night | 34°F | Mostly Clear | 5 mph WNW | 13% |
| Saturday | 59°F | Sunny | 2 to 7 mph SE | 1% |
| Saturday Night | 34°F | Mostly Clear | 3 mph SW | 0% |
| Sunday | 65°F | Sunny | 1 to 6 mph SSW | 0% |
| Sunday Night | 40°F | Mostly Clear | 3 to 9 mph WSW | 0% |
| Monday | 65°F | Sunny | 2 to 6 mph NNE | 0% |
| Monday Night | 39°F | Partly Cloudy | 2 mph WNW | 0% |
| Tuesday | 63°F | Mostly Sunny | 3 mph NE | 0% |
Forecast source: National Weather Service (api.weather.gov) for Louisville (39.970, -105.143). Updated through the day.
Growing snapshot for Louisville
Last spring frost
May 6
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
6a
More local growing data for Louisville: nearby ZIP 80027 weather · frost dates · planting calendar · Colorado frost dates
Nearby towns & communities
Allenspark
Altona
Bark Ranch
Bonanza Mountain Estates
Boulder
Coal Creek
Crisman
Eldorado Springs
Glendale
Gold Hill
Gunbarrel
Hidden Lake
Jamestown
Lafayette
Lazy Acres
Leyner
Longmont
Lyons
Mountain Meadows
Nederland
Niwot
Paragon Estates
Pine Brook Hill
Seven Hills
St. Ann Highlands
Sugarloaf
Sunshine
Superior
Tall Timber
Valmont
Climate data from the nearest NOAA station, Boulder, Co (6.4 mi from Louisville). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.