When to plant in Indiana, PA
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Indiana, Pennsylvania — all computed from Indiana's nearest NOAA weather station.
In zone 6b, Indiana gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
The average first fall frost in Indiana is now 6 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
INDIANA 3 SE · 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 Indiana’s own odds, recorded at INDIANA 3 SE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 2 | May 20 | May 4 | Sep 19 | Oct 3 | Oct 15 |
| 32°F | May 24 | May 8 | Apr 23 | Oct 1 | Oct 13 | Oct 27 |
| 28°F | May 14 | Apr 27 | Apr 13 | Oct 9 | Oct 25 | Nov 7 |
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 Indiana, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 32 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.
Indiana planting FAQ
When is the last spring frost in Indiana, PA?
Plan for the last spring frost in Indiana around May 8 (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 Indiana, PA?
Expect Indiana's first fall frost near October 13 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Indiana in?
Indiana 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 Indiana?
Indiana has about 158 frost-free days — a moderate growing season — between the average last spring frost (May 8) and first fall frost (October 13).
When should I plant tomatoes in Indiana?
For Indiana, sow tomatoes indoors about March 13–March 27 and move the seedlings out around May 15, after the last spring frost.
Never miss a window in Indiana
An email when it’s time to start seeds, transplant, and sow — timed to Indiana’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Johnstown · 38 km
- Murrysville · 47 km
- Lower Burrell · 48 km
- Greensburg · 48 km
- New Kensington · 51 km
- Plum · 52 km
- Monroeville · 56 km
- Wilkinsburg · 64 km
Frost dates recorded at INDIANA 3 SE, 4 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 Indiana, PA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00364214. Retrieved from https://blissgarden.com/pennsylvania/indiana.