Checking current alerts… View NWS forecast and alerts.
Will it freeze in Valparaiso in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Sat, Nov 7: 32°F (Sat, Nov 7, 6:00 PM CST to Sun, Nov 8, 6:00 AM CST).
Tonight: forecast low 42°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
2 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 42°F Above 36°F · Chance Rain Showers then Slight Chance Rain
- Fri, Nov 6 38°F Above 36°F · Slight Chance Rain Showers then Mostly Cloudy
- Sat, Nov 7 32°F Freeze · Mostly Clear
- Sun, Nov 8 36°F Frost possible · Mostly Clear
- Mon, Nov 9 42°F Above 36°F · Clear
- Tue, Nov 10 39°F Above 36°F · Partly Cloudy
- Wed, Nov 11 39°F Above 36°F · Partly Cloudy
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Valparaiso
The median first fall hard-freeze date (28°F) is November 5, from NOAA’s 1991–2020 Climate Normals at Valparaiso Wtr Wks. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Apr 20 · May 4 · May 22 | Sep 30 · Oct 13 · Oct 26 | 160 days |
| 32°F freeze | Apr 7 · Apr 22 · May 6 | Oct 12 · Oct 25 · Nov 6 | 185 days |
| 28°F hard freeze | Mar 25 · Apr 9 · Apr 24 | Oct 24 · Nov 5 · Nov 21 | 210 days |
Average high temperature by month
1991–2020 normals at Valparaiso Wtr Wks
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Valparaiso, IN come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Valparaiso Wtr Wks (station USC00128999, elevation 800 ft), 2.3 mi from Valparaiso. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Valparaiso
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Chesterton, IN | 8.1 mi | Apr 22 | Oct 27 |
| Westville, IN | 8.7 mi | Apr 29 | Oct 13 |
| Portage, IN | 9.9 mi | Apr 22 | Oct 27 |
| Porter, IN | 11 mi | Apr 22 | Oct 27 |
| Hobart, IN | 12 mi | Apr 22 | Oct 25 |
| Winfield, IN | 12 mi | Apr 29 | Oct 16 |
| Lake Station, IN | 12 mi | Apr 22 | Oct 27 |
| Merrillville, IN | 14 mi | Apr 22 | Oct 25 |
| Crown Point, IN | 16 mi | Apr 29 | Oct 16 |
| Gary, IN | 17 mi | Apr 22 | Oct 27 |
Frequently asked questions
When is the last frost in Valparaiso?
On average, the last spring frost (32°F) in Valparaiso is around April 22. In about 1 year in 10 it comes after May 6, and in 9 years in 10 it comes after April 7.
When is the first frost in Valparaiso?
The first fall frost (32°F) usually arrives around October 25. There’s a 10% chance of a freeze by October 12 and a 90% chance by November 6.
Can it frost in Valparaiso after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after May 4.
What growing zone is Valparaiso?
Valparaiso is in USDA Plant Hardiness Zone 6a (average annual extreme minimum temperature −10 to −5°F), based on the 2023 USDA map for ZIP code 46383. See growing zones in Indiana.
More: all Indiana frost dates · Indiana growing zones · UV index today in Valparaiso · frost vs. freeze