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Will it freeze in Osceola in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Fri, Nov 6: 28°F (Fri, Nov 6, 6:00 PM CST to Sat, Nov 7, 6:00 AM CST).
Tonight: forecast low 38°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 38°F Above 36°F · Cloudy
- Fri, Nov 6 28°F Hard freeze · Partly Cloudy
- Sat, Nov 7 35°F Frost possible · Mostly Clear
- Sun, Nov 8 38°F Above 36°F · Clear
- Mon, Nov 9 42°F Above 36°F · Clear
- Tue, Nov 10 41°F Above 36°F · Partly Cloudy
- Wed, Nov 11 42°F Above 36°F · Mostly Clear
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 Osceola
The median first fall hard-freeze date (28°F) is October 20, from NOAA’s 1991–2020 Climate Normals at Osceola. 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 24 · May 7 · May 20 | Sep 15 · Sep 29 · Oct 13 | 144 days |
| 32°F freeze | Apr 13 · Apr 29 · May 11 | Sep 24 · Oct 9 · Oct 24 | 162 days |
| 28°F hard freeze | Apr 2 · Apr 18 · May 2 | Oct 2 · Oct 20 · Nov 2 | 182 days |
Average high temperature by month
1991–2020 normals at Osceola
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 Osceola, IA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Osceola (station USC00136316, elevation 1,028 ft), 2.2 mi from Osceola. 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 Osceola
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Winterset, IA | 24 mi | Apr 30 | Oct 3 |
| Indianola, IA | 25 mi | Apr 24 | Oct 12 |
| Creston, IA | 30 mi | Apr 28 | Oct 11 |
| Norwalk, IA | 31 mi | Apr 18 | Oct 20 |
| West Des Moines, IA | 35 mi | Apr 18 | Oct 20 |
| Des Moines, IA | 39 mi | Apr 18 | Oct 20 |
| Waukee, IA | 39 mi | Apr 18 | Oct 20 |
| Windsor Heights, IA | 40 mi | Apr 18 | Oct 20 |
| Clive, IA | 40 mi | Apr 18 | Oct 20 |
| Knoxville, IA | 40 mi | Apr 20 | Oct 19 |
Frequently asked questions
When is the last frost in Osceola?
On average, the last spring frost (32°F) in Osceola is around April 29. In about 1 year in 10 it comes after May 11, and in 9 years in 10 it comes after April 13.
When is the first frost in Osceola?
The first fall frost (32°F) usually arrives around October 9. There’s a 10% chance of a freeze by September 24 and a 90% chance by October 24.
Can it frost in Osceola 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 7.
What growing zone is Osceola?
Osceola is in USDA Plant Hardiness Zone 5b (average annual extreme minimum temperature −15 to −10°F), based on the 2023 USDA map for ZIP code 50213. See growing zones in Iowa.
More: all Iowa frost dates · Iowa growing zones · frost vs. freeze