When to plant in Plano, IL
USDA Zone 5bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Plano, Illinois — all computed from Plano's nearest NOAA weather station.
In zone 5b, Plano gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
The average first fall frost in Plano is now 5 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
CHICAGO AURORA MUNI AP · 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 Plano’s own odds, recorded at CHICAGO AURORA MUNI AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 23 | May 6 | Apr 24 | Sep 20 | Oct 2 | Oct 14 |
| 32°F | May 11 | Apr 28 | Apr 14 | Sep 27 | Oct 13 | Oct 24 |
| 28°F | May 4 | Apr 18 | Apr 3 | Oct 6 | Oct 23 | Nov 4 |
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 Plano, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 32 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.
Plano planting FAQ
When is the last spring frost in Plano, IL?
Plan for the last spring frost in Plano around April 28 (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 Plano, IL?
Expect Plano'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 Plano in?
Plano 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 Plano?
Plano has about 168 frost-free days — a moderate growing season — between the average last spring frost (April 28) and first fall frost (October 13).
When should I plant tomatoes in Plano?
For Plano, sow tomatoes indoors about March 3–March 17 and move the seedlings out around May 5, after the last spring frost.
Never miss a window in Plano
An email when it’s time to start seeds, transplant, and sow — timed to Plano’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Yorkville · 9 km
- Montgomery · 15 km
- Oswego · 16 km
- North Aurora · 22 km
- Aurora · 22 km
- Batavia · 26 km
- Plainfield · 27 km
- Geneva · 28 km
Frost dates recorded at CHICAGO AURORA MUNI AP, 11 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 Plano, IL — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00004808. Retrieved from https://blissgarden.com/illinois/plano.