Checking current alerts… View NWS forecast and alerts.
Will it freeze in Tiffin 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 EST to Sun, Nov 8, 6:00 AM EST).
Tonight: forecast low 46°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
4 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 46°F Above 36°F · Cloudy then Chance Light Rain
- Fri, Nov 6 38°F Above 36°F · Mostly Cloudy
- Sat, Nov 7 32°F Freeze · Partly Cloudy
- Sun, Nov 8 34°F Frost possible · Mostly Clear
- Mon, Nov 9 40°F Above 36°F · Mostly Clear
- Tue, Nov 10 35°F Frost possible · Mostly Clear
- Wed, Nov 11 36°F Frost possible · 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 Tiffin
The median first fall hard-freeze date (28°F) is November 3, from NOAA’s 1991–2020 Climate Normals at Tiffin. 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 18 · May 2 · May 17 | Sep 30 · Oct 11 · Oct 24 | 162 days |
| 32°F freeze | Apr 8 · Apr 23 · May 7 | Oct 9 · Oct 23 · Nov 5 | 184 days |
| 28°F hard freeze | Mar 28 · Apr 11 · Apr 26 | Oct 21 · Nov 3 · Nov 19 | 207 days |
Average high temperature by month
1991–2020 normals at Tiffin
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 Tiffin, OH come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Tiffin (station USC00338313, elevation 740 ft), 0.7 mi from Tiffin. 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 Tiffin
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Fostoria, OH | 12 mi | Apr 23 | Oct 23 |
| Clyde, OH | 17 mi | Apr 26 | Oct 23 |
| Fremont, OH | 17 mi | Apr 26 | Oct 23 |
| Upper Sandusky, OH | 21 mi | Apr 29 | Oct 17 |
| Bellevue, OH | 21 mi | Apr 25 | Oct 25 |
| Bucyrus, OH | 24 mi | Apr 19 | Oct 27 |
| Willard, OH | 24 mi | Apr 25 | Oct 25 |
| Findlay, OH | 24 mi | Apr 22 | Oct 24 |
| Port Clinton, OH | 30 mi | Apr 10 | Nov 5 |
| Bowling Green, OH | 30 mi | Apr 22 | Oct 25 |
Frequently asked questions
When is the last frost in Tiffin?
On average, the last spring frost (32°F) in Tiffin is around April 23. In about 1 year in 10 it comes after May 7, and in 9 years in 10 it comes after April 8.
When is the first frost in Tiffin?
The first fall frost (32°F) usually arrives around October 23. There’s a 10% chance of a freeze by October 9 and a 90% chance by November 5.
Can it frost in Tiffin 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 2.
What growing zone is Tiffin?
Tiffin 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 44883. See growing zones in Ohio.
More: all Ohio frost dates · Ohio growing zones · frost vs. freeze