When to plant in Plainfield, IN
USDA Zone 6aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Plainfield, Indiana — all computed from Plainfield's nearest NOAA weather station.
Zone 6a means Plainfield sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
INDIANAPOLIS NWFO · 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 Plainfield’s own odds, recorded at INDIANAPOLIS NWFO.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 8 | Apr 23 | Apr 9 | Oct 5 | Oct 17 | Oct 28 |
| 32°F | Apr 28 | Apr 12 | Mar 31 | Oct 14 | Oct 27 | Nov 7 |
| 28°F | Apr 16 | Apr 1 | Mar 19 | Oct 24 | Nov 5 | Nov 20 |
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 Plainfield, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 16 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.
Plainfield planting FAQ
When is the last spring frost in Plainfield, IN?
Plainfield's average last spring frost falls near April 12 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Plainfield, IN?
In Plainfield, the first 32°F freeze of fall lands around October 27 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Plainfield in?
Plainfield is in USDA hardiness zone 6a. In zone 6a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Plainfield?
There are roughly 198 frost-free days in Plainfield (a moderate growing season), running from the average last frost around April 12 to the first fall frost near October 27.
When should I plant tomatoes in Plainfield?
In Plainfield, start tomato seeds indoors around February 15–March 1, then transplant seedlings outdoors around April 19 once the danger of frost has passed.
Never miss a window in Plainfield
An email when it’s time to start seeds, transplant, and sow — timed to Plainfield’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Avon · 8 km
- Danville · 13 km
- Speedway · 16 km
- Brownsburg · 16 km
- Indianapolis · 22 km
- Bargersville · 22 km
- Beech Grove · 25 km
- Greenwood · 25 km
Frost dates recorded at INDIANAPOLIS NWFO, 8 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 Plainfield, IN — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00124260. Retrieved from https://blissgarden.com/indiana/plainfield.