When to plant in Marion, IN
USDA Zone 6aEverything below — frost dates, hardiness zone, and what to plant when in Marion, Indiana — is derived from the closest NOAA station with complete climate normals.
In zone 6a, Marion gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
MARION 2 N · 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 Marion’s own odds, recorded at MARION 2 N.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 22 | May 7 | Apr 23 | Sep 26 | Oct 9 | Oct 21 |
| 32°F | May 12 | Apr 26 | Apr 11 | Oct 5 | Oct 20 | Nov 1 |
| 28°F | Apr 30 | Apr 14 | Mar 31 | Oct 17 | 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 Marion, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 33 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.
Marion planting FAQ
When is the last spring frost in Marion, IN?
Marion's average last spring frost falls near April 26 — 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 Marion, IN?
Expect Marion's first fall frost near October 20 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Marion in?
Marion 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 Marion?
Marion has about 177 frost-free days — a moderate growing season — between the average last spring frost (April 26) and first fall frost (October 20).
When should I plant tomatoes in Marion?
For Marion, sow tomatoes indoors about March 1–March 15 and move the seedlings out around May 3, after the last spring frost.
Never miss a window in Marion
An email when it’s time to start seeds, transplant, and sow — timed to Marion’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at MARION 2 N, 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 Marion, IN — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00125337. Retrieved from https://blissgarden.com/indiana/marion.