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.
Today
62°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. High near 62, with temperatures falling to around 59 in the afternoon. North wind 9 to 14 mph. Chance of precipitation is 100%.
7-day forecast for Pompeys Pillar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Showers And Thunderstorms | 9 to 14 mph N | 100% |
| Tonight | 52°F | Patchy Fog | 8 to 12 mph NNE | 96% |
| Sunday | 64°F | Rain Showers | 8 mph N | 77% |
| Sunday Night | 50°F | Slight Chance Rain Showers then Patchy Fog | 1 to 6 mph ENE | 15% |
| Monday | 73°F | Patchy Fog then Mostly Sunny | 1 to 5 mph SSE | 0% |
| Monday Night | 49°F | Mostly Clear | 3 mph SE | 0% |
| Tuesday | 79°F | Sunny | 3 mph SW | 0% |
| Tuesday Night | 52°F | Partly Cloudy | 3 mph SE | 6% |
| Wednesday | 81°F | Mostly Sunny | 5 mph SW | 6% |
| Wednesday Night | 53°F | Mostly Clear | 2 mph S | 6% |
| Thursday | 82°F | Sunny | 5 mph SW | 1% |
| Thursday Night | 53°F | Mostly Clear | 3 mph SE | 2% |
| Friday | 82°F | Mostly Sunny | 5 mph SSW | 0% |
| Friday Night | 52°F | Partly Cloudy | 5 mph NE | 9% |
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 19, 2026.