Louisville, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Louisville, a city in Boulder County, Colorado.
Today
74°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms between noon and 3pm, then showers and thunderstorms likely. Partly sunny. High near 74, with temperatures falling to around 68 in the afternoon. North northeast wind 3 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Louisville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Partly Sunny then Chance Showers And Thunderstorms | 3 to 8 mph NNE | 58% |
| Tonight | 49°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 6 mph W | 33% |
| Sunday | 70°F | Partly Sunny then Chance Showers And Thunderstorms | 1 to 6 mph NE | 29% |
| Sunday Night | 48°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph NNW | 29% |
| Monday | 72°F | Sunny | 1 to 7 mph ESE | 3% |
| Monday Night | 50°F | Partly Cloudy | 1 to 7 mph NNW | 13% |
| Tuesday | 74°F | Mostly Sunny | 1 to 6 mph NNE | 13% |
| Tuesday Night | 52°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph WSW | 21% |
| Wednesday | 76°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 5 mph NNE | 15% |
| Wednesday Night | 52°F | Partly Cloudy | 5 mph NW | 12% |
| Thursday | 77°F | Mostly Sunny | 3 to 7 mph SSW | 9% |
| Thursday Night | 54°F | Partly Cloudy | 1 to 6 mph SSW | 12% |
| Friday | 78°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 6 mph SSE | 16% |
| Friday Night | 54°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph SSW | 17% |
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 Sep 19, 2026.