Pompeys Pillar, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pompeys Pillar, a community in Big Horn County, Montana.
Tonight
52°F
Patchy Fog
Patchy fog and showers and thunderstorms. Cloudy, with a low around 52. North northeast wind 8 to 12 mph. Chance of precipitation is 100%.
7-day forecast for Pompeys Pillar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Patchy Fog | 8 to 12 mph NNE | 95% |
| Sunday | 63°F | Rain Showers | 8 mph NNE | 85% |
| Sunday Night | 51°F | Slight Chance Rain Showers then Areas Of Fog | 1 to 5 mph ENE | 19% |
| Monday | 71°F | Areas Of Fog then Partly Sunny | 3 mph SSE | 1% |
| Monday Night | 48°F | Mostly Clear | 1 to 5 mph SE | 0% |
| Tuesday | 78°F | Patchy Fog then Sunny | 2 mph SSW | 0% |
| Tuesday Night | 53°F | Partly Cloudy | 2 mph ESE | 4% |
| Wednesday | 80°F | Partly Sunny | 5 mph SW | 6% |
| Wednesday Night | 53°F | Mostly Clear | 3 mph S | 5% |
| Thursday | 82°F | Sunny | 5 mph SSW | 2% |
| Thursday Night | 53°F | Mostly Clear | 5 mph SE | 1% |
| Friday | 82°F | Mostly Sunny | 5 mph SSW | 0% |
| Friday Night | 53°F | Partly Cloudy | 6 mph SSE | 6% |
| Saturday | 74°F | Partly Sunny | 6 to 9 mph NNW | 11% |
Forecast source: National Weather Service (api.weather.gov) for Pompeys Pillar (45.991, -107.950). Updated through the day.
Growing snapshot for Pompeys Pillar
Last spring frost
May 13
First fall frost
Sep 29
Growing season
135 days
Hardiness zone
4b
More local growing data for Pompeys Pillar: nearby ZIP 59064 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Hardin, Mt (16.2 mi from Pompeys Pillar). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.