When to plant in Chambersburg, PA
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Chambersburg, Pennsylvania — all computed from Chambersburg's nearest NOAA weather station.
Zone 7a means many perennials and even some tender shrubs overwinter in Chambersburg, while your frost dates still decide when annuals go out.
The average first fall frost in Chambersburg is now 5 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
CHAMBERSBURG 1 ESE · 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 Chambersburg’s own odds, recorded at CHAMBERSBURG 1 ESE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 17 | Apr 30 | Apr 16 | Oct 1 | Oct 14 | Oct 28 |
| 32°F | May 5 | Apr 18 | Apr 3 | Oct 10 | Oct 25 | Nov 8 |
| 28°F | Apr 21 | Apr 4 | Mar 21 | Oct 23 | Nov 6 | Nov 21 |
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 Chambersburg, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 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.
Chambersburg planting FAQ
When is the last spring frost in Chambersburg, PA?
Plan for the last spring frost in Chambersburg 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 Chambersburg, PA?
In Chambersburg, the first 32°F freeze of fall lands around October 25 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Chambersburg in?
Chambersburg is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Chambersburg?
There are roughly 190 frost-free days in Chambersburg (a moderate growing season), running from the average last frost around April 18 to the first fall frost near October 25.
When should I plant tomatoes in Chambersburg?
In Chambersburg, 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 Chambersburg
An email when it’s time to start seeds, transplant, and sow — timed to Chambersburg’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Waynesboro · 21 km
- Hagerstown · 33 km
- Halfway · 36 km
- Carlisle · 49 km
- Frederick · 59 km
- Hanover · 59 km
- Martinsburg · 59 km
- Ballenger Creek · 64 km
Frost dates recorded at CHAMBERSBURG 1 ESE, 1 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 Chambersburg, PA — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00361354. Retrieved from https://blissgarden.com/pennsylvania/chambersburg.