When to plant in Morris, IL
USDA Zone 5bMorris, Illinois frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 5b means Morris sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
MORRIS 1 NW · 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 Morris’s own odds, recorded at MORRIS 1 NW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 18 | Apr 30 | Apr 17 | Sep 27 | Oct 12 | Oct 24 |
| 32°F | May 6 | Apr 20 | Apr 6 | Oct 9 | Oct 23 | Nov 3 |
| 28°F | Apr 24 | Apr 8 | Mar 27 | Oct 21 | Nov 1 | Nov 15 |
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 Morris, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 28 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.
Morris planting FAQ
When is the last spring frost in Morris, IL?
On average, the last spring frost in Morris is around April 20 (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 Morris, IL?
In Morris, the first 32°F freeze of fall lands around October 23 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Morris in?
Morris is in USDA hardiness zone 5b. In zone 5b, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Morris?
There are roughly 186 frost-free days in Morris (a moderate growing season), running from the average last frost around April 20 to the first fall frost near October 23.
When should I plant tomatoes in Morris?
In Morris, start tomato seeds indoors around February 23–March 9, then transplant seedlings outdoors around April 27 once the danger of frost has passed.
Never miss a window in Morris
An email when it’s time to start seeds, transplant, and sow — timed to Morris’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Channahon · 14 km
- Minooka · 14 km
- Shorewood · 23 km
- Joliet · 28 km
- Plainfield · 31 km
- Yorkville · 31 km
- Ottawa · 33 km
- Crest Hill · 34 km
Frost dates recorded at MORRIS 1 NW, 1 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 Morris, IL — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00115825. Retrieved from https://blissgarden.com/illinois/morris.