When to plant in Frankfort, IN
USDA Zone 6aEverything below — frost dates, hardiness zone, and what to plant when in Frankfort, Indiana — is derived from the closest NOAA station with complete climate normals.
Zone 6a means Frankfort sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
FRANKFORT DISPOSAL · 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 Frankfort’s own odds, recorded at FRANKFORT DISPOSAL.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 17 | May 2 | Apr 19 | Sep 27 | Oct 10 | Oct 22 |
| 32°F | May 7 | Apr 21 | Apr 7 | Oct 6 | Oct 21 | Nov 1 |
| 28°F | Apr 23 | Apr 7 | Mar 26 | Oct 19 | Nov 1 | Nov 14 |
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 Frankfort, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 35 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.
Frankfort planting FAQ
When is the last spring frost in Frankfort, IN?
Frankfort's average last spring frost falls near April 21 — 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 Frankfort, IN?
The first fall frost in Frankfort typically arrives around October 21 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Frankfort in?
Frankfort 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 Frankfort?
There are roughly 183 frost-free days in Frankfort (a moderate growing season), running from the average last frost around April 21 to the first fall frost near October 21.
When should I plant tomatoes in Frankfort?
In Frankfort, start tomato seeds indoors around February 24–March 10, then transplant seedlings outdoors around April 28 once the danger of frost has passed.
Never miss a window in Frankfort
An email when it’s time to start seeds, transplant, and sow — timed to Frankfort’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Lebanon · 28 km
- Lafayette · 31 km
- Zionsville · 37 km
- Whitestown · 37 km
- West Lafayette · 37 km
- Kokomo · 40 km
- Crawfordsville · 40 km
- Westfield · 43 km
Frost dates recorded at FRANKFORT DISPOSAL, 3 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 Frankfort, IN — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00123082. Retrieved from https://blissgarden.com/indiana/frankfort.