When to plant in Columbia, PA
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in Columbia, Pennsylvania — is derived from the closest NOAA station with complete climate normals.
Zone 7a means many perennials and even some tender shrubs overwinter in Columbia, while your frost dates still decide when annuals go out.
Frost probability
LANDISVILLE 2 NW · 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 Columbia’s own odds, recorded at LANDISVILLE 2 NW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 22 | May 9 | Apr 28 | Sep 19 | Sep 30 | Oct 12 |
| 32°F | May 13 | Apr 30 | Apr 16 | Sep 29 | Oct 10 | Oct 26 |
| 28°F | May 2 | Apr 18 | Apr 5 | Oct 8 | Oct 24 | Nov 5 |
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 Columbia, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 19 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.
Columbia planting FAQ
When is the last spring frost in Columbia, PA?
Plan for the last spring frost in Columbia around April 30 (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 Columbia, PA?
Expect Columbia's first fall frost near October 10 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Columbia in?
Columbia 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 Columbia?
There are roughly 163 frost-free days in Columbia (a moderate growing season), running from the average last frost around April 30 to the first fall frost near October 10.
When should I plant tomatoes in Columbia?
In Columbia, start tomato seeds indoors around March 5–March 19, then transplant seedlings outdoors around May 7 once the danger of frost has passed.
Never miss a window in Columbia
An email when it’s time to start seeds, transplant, and sow — timed to Columbia’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Elizabethtown · 16 km
- Lancaster · 17 km
- York · 22 km
- Shiloh · 26 km
- Weigelstown · 29 km
- Hershey · 30 km
- Ephrata · 31 km
- Lebanon · 35 km
Frost dates recorded at LANDISVILLE 2 NW, 11 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 Columbia, PA — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00364778. Retrieved from https://blissgarden.com/pennsylvania/columbia.