When to plant in Round Lake Beach, IL
USDA Zone 5bEverything below — frost dates, hardiness zone, and what to plant when in Round Lake Beach, Illinois — is derived from the closest NOAA station with complete climate normals.
In zone 5b, Round Lake Beach gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
LAKE VILLA 2NE · 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 Round Lake Beach’s own odds, recorded at LAKE VILLA 2NE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 21 | May 5 | Apr 22 | Sep 28 | Oct 11 | Oct 25 |
| 32°F | May 9 | Apr 24 | Apr 11 | Oct 8 | Oct 23 | Nov 4 |
| 28°F | Apr 28 | Apr 13 | Mar 31 | Oct 20 | Nov 3 | Nov 16 |
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 Round Lake Beach, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 14 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.
Round Lake Beach planting FAQ
When is the last spring frost in Round Lake Beach, IL?
Round Lake Beach's average last spring frost falls near April 24 — 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 Round Lake Beach, IL?
Expect Round Lake Beach's first fall frost near October 23 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Round Lake Beach in?
Round Lake Beach 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 Round Lake Beach?
Round Lake Beach has about 182 frost-free days — a moderate growing season — between the average last spring frost (April 24) and first fall frost (October 23).
When should I plant tomatoes in Round Lake Beach?
For Round Lake Beach, sow tomatoes indoors about February 27–March 13 and move the seedlings out around May 1, after the last spring frost.
Never miss a window in Round Lake Beach
An email when it’s time to start seeds, transplant, and sow — timed to Round Lake Beach’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Round Lake · 5 km
- Lindenhurst · 6 km
- Grayslake · 6 km
- Gages Lake · 9 km
- Fox Lake · 10 km
- Antioch · 11 km
- Gurnee · 12 km
- Wauconda · 13 km
Frost dates recorded at LAKE VILLA 2NE, 6 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 Round Lake Beach, IL — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00114837. Retrieved from https://blissgarden.com/illinois/round-lake-beach.