USDA Hardiness Zone 8b
Frost Dates for 30471 — Twin City, Georgia
NOAA 1991–2020 normals from Metter, GA (120 ft), 12 miles southeast.
Updated
In Twin City, the last spring frost (32°F) is around March 2 in half of years and has passed by March 25 in nine years out of ten. The first fall frost comes around November 27, as early as November 7 one year in ten, leaving a typical freeze-free season of 269 days (NOAA, Metter, GA).
- Last spring frost
- March 2
- First fall frost
- November 27
- Growing season
- 269 days
- Hardiness zone
- 8b
50% probability
50% probability
freeze-free, 50%
15 to 20°F (-9.4 to -6.7°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 25 observed
NOAA normal
Frost risk by date in Twin City
Half of springs at Metter, GA see their last 32°F night by March 2; only one in ten is past it by February 2, and one in ten still has one after March 25. Planting tender crops after March 11 leaves a 30% risk of a frost on them, after March 17 20%, and after March 25 10%. The 23 days between the even-odds date and the one-in-ten date is wider than at 92% of the 127 Georgia stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.
In fall the first 32°F night comes by November 27 in half of years, as early as November 7 one year in ten, and holds off past December 28 one year in ten. A hard freeze of 28°F follows 19 days later, around December 16; in spring the one-in-ten date for 28°F is March 12, 13 days before the 32°F one. The freeze-free season lasts 269 days in a typical year, longer than at 93% of the 127 Georgia stations; it reaches 306 days one year in ten and falls short of 240 one year in ten. On average 24 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 17 days longer, to about March 19, and return around November 13. Nights of 24°F, cold enough to damage hardier plants, come in 78% of winters and 16°F in 10%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Feb 27 | Mar 4 | Mar 10 | Mar 15 | Mar 19 | Mar 23 | Mar 27 | Mar 31 | Apr 7 |
| 32°F | Feb 2 | Feb 13 | Feb 21 | Feb 27 | Mar 2 | Mar 6 | Mar 11 | Mar 17 | Mar 25 |
| 28°F97% of yrs | Jan 14 | Jan 25 | Feb 1 | Feb 6 | Feb 12 | Feb 19 | Feb 28 | Mar 4 | Mar 12 |
| 24°F78% of yrs | Dec 29 | Jan 7 | Jan 14 | Jan 21 | Jan 28 | Feb 2 | Feb 9 | Feb 19 | Mar 2 |
| 20°F39% of yrs | too rare for a date | ||||||||
| 16°F10% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 13 | Nov 17 | Nov 21 | Nov 27 | Dec 5 |
| 32°F | Nov 7 | Nov 12 | Nov 18 | Nov 22 | Nov 27 | Dec 2 | Dec 6 | Dec 15 | Dec 28 |
| 28°F97% of yrs | Nov 17 | Nov 26 | Dec 3 | Dec 8 | Dec 16 | Dec 24 | Jan 1 | Jan 7 | Jan 14 |
| 24°F78% of yrs | Dec 3 | Dec 10 | Dec 20 | Dec 28 | Jan 3 | Jan 7 | Jan 12 | Jan 19 | Feb 2 |
| 20°F39% of yrs | too rare for a date | ||||||||
| 16°F10% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Metter, GA, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 30471 →Compare Twin City with another place →
Weather by month in Twin City
July is the warmest month at Metter, GA, averaging 92°F by day and 73°F at night; January is the coldest at 60°F and 39°F. A freezing night is all but certain in January (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 82% of years and March still brings one in 52% of years.
Warmth for growing adds up to 6,467 growing degree days a year (base 50°F), more than at 87% of the 127 Georgia stations. 42% of them (2,710) have built up by the end of June, and July adds the most, 1,006. Precipitation totals 47.2 inches a year, most in July (5.6") and least in October (2.7"); May to September bring 47% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 60 | 39 | 4.1 | 95% | 10 | 109 |
| Feb | 65 | 42 | 3.8 | 82% | 5 | 152 |
| Mar | 71 | 48 | 4.3 | 52% | 2 | 313 |
| Apr | 78 | 54 | 2.8 | 4% | <1 | 482 |
| May | 86 | 63 | 3.4 | 0% | 0 | 752 |
| Jun | 91 | 70 | 4.9 | 0% | 0 | 903 |
| Jul | 92 | 73 | 5.6 | 0% | 0 | 1006 |
| Aug | 91 | 73 | 4.8 | 0% | 0 | 987 |
| Sep | 86 | 68 | 3.5 | 0% | 0 | 813 |
| Oct | 78 | 57 | 2.7 | 2% | 0 | 544 |
| Nov | 69 | 47 | 3.0 | 55% | 3 | 259 |
| Dec | 63 | 41 | 4.3 | 83% | 5 | 149 |
Monthly normals 1991–2020 at Metter, GA (120 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Midville Exp Stn, GA, 23 miles north of Twin City and 160 feet higher, has a last frost 16 days later (March 18), a first frost 16 days earlier (November 11), a season 32 days shorter.
When it snows in Twin City, Georgia
Measurable snow is rare here: only 0 of 25 winters from 1991 to 2020 recorded 0.1 inch or more at Midville Exp Stn, GA, 22.8 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 30471
| When | What to do |
|---|---|
| December 22 – January 5 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| January 5 – January 19 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| February 2 – February 16 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 2 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by September 4 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by November 13 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 27 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 30471 is 12 miles from Metter, GA, which stands at 120 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 30474 (Vidalia). The 2023 USDA Plant Hardiness Zone Map lists ZIP 30471 in zone 8b, the band where the coldest night of the year averaged 15 to 20°F (-9.4 to -6.7°C) over 1991–2020; a zone describes winter lows, not frost dates.
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.