# Frost dates for Naperville, IL (60540)

**Do this (Safe, 2026-11-02):** Frost season started Oct 1. Keep covers ready for cold nights.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | May 14 | Oct 1 | 140 |
| Median | Apr 28 | Oct 16 | 171 |
| Bold (9 in 10 years later) | Apr 14 | Oct 29 | 198 |

Frost = 32°F. Station: Lisle-morton Arboretum, IL, 6 mi away.

## Next nights (NWS overnight low)

- 2026-11-01: 55°F — Go (tonight)
- 2026-11-02: 60°F — Go
- 2026-11-03: 58°F — Go
- 2026-11-04: 49°F — Go
- 2026-11-05: 46°F — Go
- 2026-11-06: 42°F — Go
- 2026-11-07: 41°F — Go

Go above 40°F · Wait 37–40°F · Cover 36°F or less · Freeze 28°F or less.

Source: Frost dates: NOAA NCEI U.S. Climate Normals 1991–2020, station Lisle-morton Arboretum, IL (6 mi, about your height). Not endorsed by NOAA. Nights: National Weather Service.

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