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Will it freeze in St. Marys in the next 7 nights?
No overnight lows at or below 32°F are forecast in St. Marys during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 67°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 67°F Above 36°F · Partly Cloudy then Patchy Fog
- Fri, Nov 6 59°F Above 36°F · Slight Chance Rain Showers then Mostly Cloudy
- Sat, Nov 7 57°F Above 36°F · Partly Cloudy
- Sun, Nov 8 55°F Above 36°F · Partly Cloudy
- Mon, Nov 9 54°F Above 36°F · Slight Chance Rain Showers
- Tue, Nov 10 54°F Above 36°F · Slight Chance Rain Showers
- Wed, Nov 11 53°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 St. Marys
The median first fall hard-freeze date (28°F) is January 3, from NOAA’s 1991–2020 Climate Normals at Brunswick 23 S. 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 | Feb 12 · Mar 5 · Mar 31 | Nov 11 · Nov 29 · Dec 22 | 267 days |
| 32°F freeze | Jan 19 · Feb 19 · Mar 14 | Nov 21 · Dec 14 · Jan 15 | 299 days |
| 28°F hard freeze | Dec 31 · Feb 3 · Feb 28 | Dec 2 · Jan 3 · Feb 7 | 331 days |
Average high temperature by month
1991–2020 normals at Brunswick 23 S
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 St. Marys, GA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Brunswick 23 S (station USW00063856, elevation 25 ft), 7.9 mi from St. Marys. 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 St. Marys
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Fernandina Beach, FL | 9.9 mi | Feb 2 | Jan 4 |
| Kingsland, GA | 14 mi | Mar 14 | Nov 25 |
| Brunswick, GA | 27 mi | Feb 8 | Dec 25 |
| Jacksonville, FL | 29 mi | Feb 1 | Jan 5 |
| Atlantic Beach, FL | 31 mi | Jan 31 | Jan 10 |
| Neptune Beach, FL | 32 mi | Jan 31 | Jan 10 |
| Jacksonville Beach, FL | 35 mi | Jan 31 | Jan 10 |
| Orange Park, FL | 41 mi | Feb 1 | Jan 5 |
| Macclenny, FL | 46 mi | Mar 8 | Dec 1 |
| Green Cove Springs, FL | 53 mi | Feb 1 | Jan 5 |
Frequently asked questions
When is the last frost in St. Marys?
On average, the last spring frost (32°F) in St. Marys is around February 19. In about 1 year in 10 it comes after March 14, and in 9 years in 10 it comes after January 19.
When is the first frost in St. Marys?
The first fall frost (32°F) usually arrives around December 14. There’s a 10% chance of a freeze by November 21 and a 90% chance by January 15.
Can it frost in St. Marys 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 March 5.
What growing zone is St. Marys?
St. Marys is in USDA Plant Hardiness Zone 9a (average annual extreme minimum temperature 20 to 25°F), based on the 2023 USDA map for ZIP code 31547. See growing zones in Georgia.
More: all Georgia frost dates · Georgia growing zones · frost vs. freeze