Boulder Flats, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Boulder Flats, a community in Fremont County, Wyoming.
This Afternoon
73°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3pm, then a chance of showers and thunderstorms. Partly sunny. High near 73, with temperatures falling to around 70 in the afternoon. South wind around 8 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Boulder Flats
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Chance Showers And Thunderstorms | 8 mph S | 49% |
| Tonight | 50°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 1 to 7 mph WNW | 47% |
| Saturday | 67°F | Slight Chance Showers And Thunderstorms | 1 to 8 mph N | 42% |
| Saturday Night | 45°F | Showers And Thunderstorms Likely | 1 to 7 mph WSW | 67% |
| Sunday | 63°F | Chance Showers And Thunderstorms | 0 to 6 mph ENE | 41% |
| Sunday Night | 44°F | Partly Cloudy | 1 to 6 mph SE | 7% |
| Monday | 68°F | Sunny | 0 to 5 mph NE | 2% |
| Monday Night | 46°F | Mostly Clear | 6 mph NW | 1% |
| Tuesday | 72°F | Mostly Sunny | 5 mph SSE | 4% |
| Tuesday Night | 49°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 8 mph WSW | 23% |
| Wednesday | 74°F | Sunny then Slight Chance Showers And Thunderstorms | 5 mph NNW | 10% |
| Wednesday Night | 49°F | Mostly Clear | 7 mph W | 4% |
| Thursday | 76°F | Mostly Sunny | 5 mph NNW | 4% |
| Thursday Night | 50°F | Partly Cloudy | 7 mph WSW | 7% |
Forecast source: National Weather Service (api.weather.gov) for Boulder Flats (42.916, -108.799). Updated through the day.
Growing snapshot for Boulder Flats
Last spring frost
May 16
First fall frost
Sep 28
Growing season
133 days
Hardiness zone
5a
More local growing data for Boulder Flats: nearby ZIP 82510 weather · frost dates · planting calendar · Wyoming frost dates
Nearby towns & communities
Arapahoe
Atlantic City
Crowheart
Dubois
Ethete
Fort Washakie
Hudson
Jeffrey City
Johnstown
Lander
Pavillion
Riverton
Shoshoni
Climate data from the nearest NOAA station, Riverton, Wy (8.1 mi from Boulder Flats). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.