When to plant in Roselle, IL
USDA Zone 5bEverything below — frost dates, hardiness zone, and what to plant when in Roselle, Illinois — is derived from the closest NOAA station with complete climate normals.
Zone 5b means Roselle sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
The average last spring frost in Roselle is now 11 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
STREAMWOOD · 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 Roselle’s own odds, recorded at STREAMWOOD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 29 | May 12 | Apr 28 | Sep 21 | Oct 4 | Oct 16 |
| 32°F | May 16 | Apr 30 | Apr 17 | Sep 29 | Oct 13 | Oct 25 |
| 28°F | May 3 | Apr 20 | Apr 6 | Oct 8 | Oct 24 | Nov 5 |
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 Roselle, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 15 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.
Roselle planting FAQ
When is the last spring frost in Roselle, IL?
Roselle's average last spring frost falls near April 30 — 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 Roselle, IL?
Expect Roselle's first fall frost near October 13 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Roselle in?
Roselle 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 Roselle?
There are roughly 166 frost-free days in Roselle (a moderate growing season), running from the average last frost around April 30 to the first fall frost near October 13.
When should I plant tomatoes in Roselle?
In Roselle, start tomato seeds indoors around March 5–March 19, then transplant seedlings outdoors around May 7 once the danger of frost has passed.
Never miss a window in Roselle
An email when it’s time to start seeds, transplant, and sow — timed to Roselle’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Bloomingdale · 3 km
- Hanover Park · 5 km
- Schaumburg · 5 km
- Glendale Heights · 7 km
- Carol Stream · 8 km
- Bartlett · 8 km
- Elk Grove Village · 8 km
- Addison · 8 km
Frost dates recorded at STREAMWOOD, 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 Roselle, IL — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00118324. Retrieved from https://blissgarden.com/illinois/roselle.