When to plant in Butler, PA
USDA Zone 6bEverything below — frost dates, hardiness zone, and what to plant when in Butler, Pennsylvania — is derived from the closest NOAA station with complete climate normals.
Zone 6b means Butler sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
BUTLER 2 SW · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Butler’s own odds, recorded at BUTLER 2 SW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 1 | May 19 | May 1 | Sep 21 | Oct 3 | Oct 15 |
| 32°F | May 23 | May 7 | Apr 22 | Oct 1 | Oct 14 | Oct 30 |
| 28°F | May 14 | Apr 26 | Apr 10 | Oct 12 | Oct 27 | Nov 9 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Butler, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 28 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Butler planting FAQ
When is the last spring frost in Butler, PA?
Plan for the last spring frost in Butler around May 7 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Butler, PA?
The first fall frost in Butler typically arrives around October 14 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Butler in?
Butler is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Butler?
There are roughly 160 frost-free days in Butler (a moderate growing season), running from the average last frost around May 7 to the first fall frost near October 14.
When should I plant tomatoes in Butler?
In Butler, start tomato seeds indoors around March 12–March 26, then transplant seedlings outdoors around May 14 once the danger of frost has passed.
Never miss a window in Butler
An email when it’s time to start seeds, transplant, and sow — timed to Butler’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Allison Park · 33 km
- New Kensington · 34 km
- Lower Burrell · 34 km
- Franklin Park · 34 km
- New Castle · 41 km
- Plum · 42 km
- Wilkinsburg · 46 km
- Carnot-Moon · 47 km
Frost dates recorded at BUTLER 2 SW, 3 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Butler, PA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00361139. Retrieved from https://blissgarden.com/pennsylvania/butler.