Mifflinburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mifflinburg, a borough in Union County, Pennsylvania.
Today
73°F
Patchy Fog then Mostly Sunny
Patchy fog before 9am. Mostly sunny, with a high near 73. Southeast wind 0 to 9 mph.
7-day forecast for Mifflinburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Patchy Fog then Mostly Sunny | 0 to 9 mph SE | 1% |
| Tonight | 58°F | Mostly Cloudy then Light Rain | 6 mph S | 86% |
| Thursday | 72°F | Light Rain | 3 to 7 mph S | 86% |
| Thursday Night | 50°F | Chance Light Rain then Mostly Cloudy | 2 mph W | 26% |
| Friday | 67°F | Slight Chance Light Rain | 1 mph W | 15% |
| Friday Night | 45°F | Partly Cloudy | 2 mph W | 11% |
| Saturday | 58°F | Chance Light Rain | 3 to 9 mph W | 26% |
| Saturday Night | 39°F | Slight Chance Light Rain | 8 mph W | 24% |
| Sunday | 58°F | Mostly Sunny | 5 to 8 mph W | 6% |
| Sunday Night | 36°F | Partly Cloudy | 6 mph W | 6% |
| Monday | 58°F | Mostly Sunny | 5 to 10 mph W | 9% |
| Monday Night | 34°F | Partly Cloudy | 2 to 6 mph W | 9% |
| Tuesday | 61°F | Mostly Sunny | 3 to 10 mph W | 2% |
| Tuesday Night | 35°F | Partly Cloudy | 2 to 6 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Mifflinburg (40.920, -77.047). Updated through the day.
Growing snapshot for Mifflinburg
Last spring frost
Apr 25
First fall frost
Oct 19
Growing season
175 days
Hardiness zone
6b
More local growing data for Mifflinburg: nearby ZIP 17844 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Laurelton Ctr, Pa (7.8 mi from Mifflinburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.