When to plant in Jefferson Hills, PA
USDA Zone 6bJefferson Hills, Pennsylvania frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 6b means Jefferson Hills sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
PITTSBURGH ALLEGHENY CO AP · 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 Jefferson Hills’s own odds, recorded at PITTSBURGH ALLEGHENY CO AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 17 | Apr 29 | Apr 16 | Oct 4 | Oct 17 | Oct 29 |
| 32°F | May 6 | Apr 18 | Apr 2 | Oct 14 | Oct 28 | Nov 10 |
| 28°F | Apr 21 | Apr 5 | Mar 23 | Oct 28 | Nov 8 | Nov 22 |
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 Jefferson Hills, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 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.
Jefferson Hills planting FAQ
When is the last spring frost in Jefferson Hills, PA?
Plan for the last spring frost in Jefferson Hills around April 18 (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 Jefferson Hills, PA?
In Jefferson Hills, the first 32°F freeze of fall lands around October 28 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Jefferson Hills in?
Jefferson Hills 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 Jefferson Hills?
There are roughly 193 frost-free days in Jefferson Hills (a moderate growing season), running from the average last frost around April 18 to the first fall frost near October 28.
When should I plant tomatoes in Jefferson Hills?
In Jefferson Hills, start tomato seeds indoors around February 21–March 7, then transplant seedlings outdoors around April 25 once the danger of frost has passed.
Never miss a window in Jefferson Hills
An email when it’s time to start seeds, transplant, and sow — timed to Jefferson Hills’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- West Mifflin · 7 km
- Whitehall · 8 km
- Bethel Park · 8 km
- Baldwin · 9 km
- McKeesport · 10 km
- Munhall · 11 km
- Pittsburgh · 16 km
- Wilkinsburg · 17 km
Frost dates recorded at PITTSBURGH ALLEGHENY CO AP, 7 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 Jefferson Hills, PA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00014762. Retrieved from https://blissgarden.com/pennsylvania/jefferson-hills.