When to plant in New Haven, IN
USDA Zone 6aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for New Haven, Indiana — all computed from New Haven's nearest NOAA weather station.
New Haven's nearest full-normals station sits about 18 km out, so treat these as a close estimate — local microclimate can nudge your first and last frost. In zone 6a, New Haven gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
WOODBURN 3N · 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 New Haven’s own odds, recorded at WOODBURN 3N.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 20 | May 5 | Apr 23 | Sep 23 | Oct 7 | Oct 21 |
| 32°F | May 11 | Apr 27 | Apr 13 | Oct 4 | Oct 19 | Oct 31 |
| 28°F | May 1 | Apr 15 | Mar 31 | Oct 16 | Oct 30 | Nov 12 |
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 New Haven, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 25 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.
New Haven planting FAQ
When is the last spring frost in New Haven, IN?
Plan for the last spring frost in New Haven around April 27 (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 New Haven, IN?
Expect New Haven's first fall frost near October 19 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is New Haven in?
New Haven 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 New Haven?
New Haven has about 175 frost-free days — a moderate growing season — between the average last spring frost (April 27) and first fall frost (October 19).
When should I plant tomatoes in New Haven?
For New Haven, sow tomatoes indoors about March 2–March 16 and move the seedlings out around May 4, after the last spring frost.
Never miss a window in New Haven
An email when it’s time to start seeds, transplant, and sow — timed to New Haven’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Fort Wayne · 11 km
- Huntertown · 21 km
- Auburn · 34 km
- Bluffton · 38 km
- Van Wert · 42 km
- Huntington · 46 km
- Kendallville · 46 km
- Defiance · 59 km
Frost dates recorded at WOODBURN 3N, 18 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 New Haven, IN — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00129724. Retrieved from https://blissgarden.com/indiana/new-haven.