Fairfax, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fairfax, a town in Boyd County, South Dakota.
Today
71°F
Scattered Rain Showers
Scattered rain showers before 5pm. Mostly cloudy, with a high near 71. North northwest wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Fairfax
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Scattered Rain Showers | 5 to 10 mph NNW | 36% |
| Tonight | 54°F | Partly Cloudy | 5 mph W | 2% |
| Wednesday | 77°F | Mostly Sunny | 5 to 10 mph SSW | 2% |
| Wednesday Night | 58°F | Mostly Clear | 10 mph S | 1% |
| Thursday | 85°F | Sunny | 10 to 20 mph S | 7% |
| Thursday Night | 65°F | Mostly Clear | 15 mph S | 7% |
| Friday | 90°F | Sunny | 10 to 15 mph SSW | 7% |
| Friday Night | 66°F | Mostly Clear | 10 mph S | 6% |
| Saturday | 94°F | Sunny | 10 to 20 mph S | 2% |
| Saturday Night | 68°F | Mostly Clear | 10 to 20 mph S | 7% |
| Sunday | 92°F | Mostly Sunny | 10 to 15 mph SE | 3% |
| Sunday Night | 69°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph E | 17% |
| Monday | 91°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 10 to 15 mph ENE | 17% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph ENE | 16% |
Forecast source: National Weather Service (api.weather.gov) for Fairfax (43.028, -98.889). Updated through the day.
Growing snapshot for Fairfax
Last spring frost
May 4
First fall frost
Oct 6
Growing season
152 days
Hardiness zone
5a
More local growing data for Fairfax: nearby ZIP 68722 weather · frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Butte, Ne (1.5 mi from Fairfax). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.