Louisville, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Louisville, a city in Boulder County, Colorado.
This Afternoon
77°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 77, with temperatures falling to around 70 in the afternoon. Northwest wind around 7 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Louisville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Chance Showers And Thunderstorms | 7 mph NW | 48% |
| Tonight | 49°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 6 mph SW | 29% |
| Sunday | 69°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 1 to 6 mph NNE | 30% |
| Sunday Night | 48°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 6 mph WNW | 22% |
| Monday | 72°F | Sunny | 1 to 6 mph NE | 2% |
| Monday Night | 50°F | Partly Cloudy | 1 to 6 mph NNW | 5% |
| Tuesday | 76°F | Mostly Sunny | 1 to 5 mph N | 8% |
| Tuesday Night | 53°F | Partly Cloudy | 1 to 5 mph SSW | 13% |
| Wednesday | 78°F | Partly Sunny | 1 to 5 mph N | 9% |
| Wednesday Night | 53°F | Mostly Cloudy | 3 mph NW | 10% |
| Thursday | 79°F | Mostly Sunny | 2 to 8 mph SSE | 6% |
| Thursday Night | 55°F | Mostly Cloudy | 1 to 7 mph S | 11% |
| Friday | 78°F | Mostly Sunny then Chance Showers And Thunderstorms | 1 to 6 mph SSE | 27% |
| Friday Night | 55°F | Chance Rain Showers | 5 mph SSW | 25% |
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 20, 2026.