When to plant in Portage, IN
USDA Zone 6aEverything below — frost dates, hardiness zone, and what to plant when in Portage, Indiana — is derived from the closest NOAA station with complete climate normals.
Zone 6a means Portage sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
INDIANA DUNES NL · 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 Portage’s own odds, recorded at INDIANA DUNES NL.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 21 | May 4 | Apr 20 | Oct 4 | Oct 16 | Oct 30 |
| 32°F | May 8 | Apr 22 | Apr 7 | Oct 15 | Oct 27 | Nov 9 |
| 28°F | Apr 23 | Apr 8 | Mar 26 | Oct 26 | Nov 7 | Nov 25 |
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 Portage, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 21 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.
Portage planting FAQ
When is the last spring frost in Portage, IN?
On average, the last spring frost in Portage is around April 22 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Portage, IN?
Expect Portage's first fall frost near October 27 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Portage in?
Portage 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 Portage?
There are roughly 188 frost-free days in Portage (a moderate growing season), running from the average last frost around April 22 to the first fall frost near October 27.
When should I plant tomatoes in Portage?
In Portage, start tomato seeds indoors around February 25–March 11, then transplant seedlings outdoors around April 29 once the danger of frost has passed.
Never miss a window in Portage
An email when it’s time to start seeds, transplant, and sow — timed to Portage’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Lake Station · 6 km
- Chesterton · 10 km
- Hobart · 12 km
- Gary · 14 km
- Valparaiso · 16 km
- Merrillville · 17 km
- Griffith · 21 km
- Highland · 24 km
Frost dates recorded at INDIANA DUNES NL, 9 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 Portage, IN — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00124244. Retrieved from https://blissgarden.com/indiana/portage.