Mammoth, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mammoth, a community in Westmoreland County, Pennsylvania.
This Afternoon
76°F
Sunny
Sunny, with a high near 76. Southeast wind around 1 mph.
7-day forecast for Mammoth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Sunny | 1 mph SE | 1% |
| Tonight | 53°F | Mostly Clear | 3 to 7 mph SE | 2% |
| Wednesday | 78°F | Partly Sunny | 3 to 8 mph SE | 4% |
| Wednesday Night | 61°F | Light Rain | 10 mph S | 99% |
| Thursday | 71°F | Light Rain Likely | 8 to 14 mph SW | 60% |
| Thursday Night | 52°F | Mostly Cloudy then Slight Chance Light Rain | 1 to 7 mph SW | 15% |
| Friday | 66°F | Slight Chance Light Rain | 1 to 7 mph W | 22% |
| Friday Night | 45°F | Chance Light Rain | 1 to 5 mph NW | 38% |
| Saturday | 55°F | Chance Light Rain | 5 to 12 mph W | 38% |
| Saturday Night | 38°F | Chance Light Rain | 3 to 8 mph W | 33% |
| Sunday | 56°F | Slight Chance Light Rain | 5 to 13 mph SW | 17% |
| Sunday Night | 37°F | Chance Light Rain | 10 mph SW | 27% |
| Monday | 56°F | Chance Light Rain | 12 to 18 mph W | 37% |
| Monday Night | 37°F | Chance Light Rain | 10 to 15 mph SW | 37% |
Forecast source: National Weather Service (api.weather.gov) for Mammoth (40.199, -79.463). Updated through the day.
Growing snapshot for Mammoth
Last spring frost
May 1
First fall frost
Oct 13
Growing season
164 days
Hardiness zone
6b
More local growing data for Mammoth: nearby ZIP 15674 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Mt Pleasant, Pa (0.6 mi from Mammoth). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.