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Will it freeze in Port Royal in the next 7 nights?
No overnight lows at or below 32°F are forecast in Port Royal during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 69°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 69°F Above 36°F · Mostly Cloudy
- Fri, Nov 6 62°F Above 36°F · Chance Showers And Thunderstorms then Mostly Cloudy
- Sat, Nov 7 56°F Above 36°F · Partly Cloudy
- Sun, Nov 8 51°F Above 36°F · Partly Cloudy
- Mon, Nov 9 51°F Above 36°F · Partly Cloudy then Slight Chance Rain Showers
- Tue, Nov 10 52°F Above 36°F · Partly Cloudy
- Wed, Nov 11 52°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 Port Royal
The median first fall hard-freeze date (28°F) is December 28, from NOAA’s 1991–2020 Climate Normals at Beaufort Wastewater Plant. 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 27 · Mar 16 · Apr 1 | Nov 10 · Nov 26 · Dec 15 | 255 days |
| 32°F freeze | Feb 2 · Mar 3 · Mar 20 | Nov 21 · Dec 9 · Jan 4 | 282 days |
| 28°F hard freeze | Jan 9 · Feb 9 · Mar 11 | Dec 3 · Dec 28 · Jan 21 | 312 days |
Average high temperature by month
1991–2020 normals at Beaufort Wastewater Plant
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 Port Royal, SC come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Beaufort Wastewater Plant (station USC00380559, elevation 25 ft), 2.8 mi from Port Royal. 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 Port Royal
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Beaufort, SC | 7.5 mi | Feb 28 | Dec 3 |
| Hilton Head Island, SC | 12 mi | Mar 3 | Dec 9 |
| Bluffton, SC | 17 mi | Mar 2 | Nov 30 |
| Hardeeville, SC | 21 mi | Mar 2 | Nov 30 |
| Rincon, GA | 32 mi | Mar 2 | Nov 30 |
| Port Wentworth, GA | 32 mi | Mar 2 | Nov 30 |
| Garden City, GA | 34 mi | Mar 2 | Nov 30 |
| Pooler, GA | 37 mi | Mar 2 | Nov 30 |
| Savannah, GA | 37 mi | Mar 2 | Nov 30 |
| Walterboro, SC | 38 mi | Mar 19 | Nov 12 |
Frequently asked questions
When is the last frost in Port Royal?
On average, the last spring frost (32°F) in Port Royal is around March 3. In about 1 year in 10 it comes after March 20, and in 9 years in 10 it comes after February 2.
When is the first frost in Port Royal?
The first fall frost (32°F) usually arrives around December 9. There’s a 10% chance of a freeze by November 21 and a 90% chance by January 4.
Can it frost in Port Royal 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 16.
What growing zone is Port Royal?
Port Royal 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 29905. See growing zones in South Carolina.
More: all South Carolina frost dates · South Carolina growing zones · frost vs. freeze