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Will it freeze in Webster City in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Fri, Nov 6: 27°F (Fri, Nov 6, 6:00 PM CST to Sat, Nov 7, 6:00 AM CST).
Tonight: forecast low 34°F. Frost possible.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
4 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 34°F Frost possible · Cloudy
- Fri, Nov 6 27°F Hard freeze · Partly Cloudy
- Sat, Nov 7 34°F Frost possible · Partly Cloudy
- Sun, Nov 8 36°F Frost possible · Clear
- Mon, Nov 9 38°F Above 36°F · Mostly Clear
- Tue, Nov 10 38°F Above 36°F · Partly Cloudy
- Wed, Nov 11 40°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 Webster City
The median first fall hard-freeze date (28°F) is October 12, from NOAA’s 1991–2020 Climate Normals at Webster City. 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 30 · May 11 · May 24 | Sep 10 · Sep 23 · Oct 5 | 133 days |
| 32°F freeze | Apr 20 · May 3 · May 16 | Sep 18 · Oct 2 · Oct 16 | 150 days |
| 28°F hard freeze | Apr 10 · Apr 24 · May 7 | Sep 27 · Oct 12 · Oct 25 | 169 days |
Average high temperature by month
1991–2020 normals at Webster City
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 Webster City, IA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Webster City (station USC00138806, elevation 1,072 ft), 1.1 mi from Webster City. 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 Webster City
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Fort Dodge, IA | 19 mi | Apr 28 | Oct 8 |
| Iowa Falls, IA | 29 mi | Apr 28 | Oct 10 |
| Boone, IA | 29 mi | Apr 28 | Oct 12 |
| Ames, IA | 32 mi | Apr 26 | Oct 8 |
| Nevada, IA | 35 mi | Apr 26 | Oct 12 |
| Perry, IA | 45 mi | Apr 25 | Oct 10 |
| Polk City, IA | 47 mi | Apr 19 | Oct 18 |
| Algona, IA | 47 mi | Apr 30 | Oct 6 |
| Clear Lake, IA | 52 mi | May 3 | Oct 1 |
| Ankeny, IA | 52 mi | Apr 23 | Oct 15 |
Frequently asked questions
When is the last frost in Webster City?
On average, the last spring frost (32°F) in Webster City is around May 3. In about 1 year in 10 it comes after May 16, and in 9 years in 10 it comes after April 20.
When is the first frost in Webster City?
The first fall frost (32°F) usually arrives around October 2. There’s a 10% chance of a freeze by September 18 and a 90% chance by October 16.
Can it frost in Webster City 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 11.
What growing zone is Webster City?
Webster City is in USDA Plant Hardiness Zone 5a (average annual extreme minimum temperature −20 to −15°F), based on the 2023 USDA map for ZIP code 50595. See growing zones in Iowa.
More: all Iowa frost dates · Iowa growing zones · frost vs. freeze