USDA Hardiness Zone 8b
Frost Dates for 39345 — Newton, Mississippi
NOAA 1991–2020 normals from Newton Exp Stn, MS (349 ft), 4 miles east.
Updated
In Newton, the last spring frost (32°F) is around March 25 in half of years and has passed by April 12 in nine years out of ten. The first fall frost comes around November 2, as early as October 20 one year in ten, leaving a typical freeze-free season of 222 days (NOAA, Newton Exp Stn, MS).
- Last spring frost
- March 25
- First fall frost
- November 2
- Growing season
- 222 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
- 25%
- Snow per year
- 0.4"
median, 1991–2020
median, 1991–2020
7 of 28 observed
NOAA normal
Frost risk by date in Newton
Half of springs at Newton Exp Stn, MS see their last 32°F night by March 25; only one in ten is past it by March 4, and one in ten still has one after April 12. Planting tender crops after April 2 leaves a 30% risk of a frost on them, after April 6 20%, and after April 12 10%. The 18 days between the even-odds date and the one-in-ten date is narrower than at 53% of the 96 Mississippi stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 2 in half of years, as early as October 20 one year in ten, and holds off past November 20 one year in ten. A hard freeze of 28°F follows 13 days later, around November 15; in spring the one-in-ten date for 28°F is March 28, 15 days before the 32°F one. The freeze-free season lasts 222 days in a typical year, shorter than at 80% of the 96 Mississippi stations; it reaches 247 days one year in ten and falls short of 198 one year in ten. On average 64 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 14 days longer, to about April 8, and return around October 25. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 66%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 20 | Mar 28 | Apr 2 | Apr 5 | Apr 8 | Apr 11 | Apr 14 | Apr 18 | Apr 24 |
| 32°F | Mar 4 | Mar 11 | Mar 17 | Mar 21 | Mar 25 | Mar 29 | Apr 2 | Apr 6 | Apr 12 |
| 28°F | Feb 17 | Feb 25 | Mar 1 | Mar 6 | Mar 10 | Mar 14 | Mar 18 | Mar 23 | Mar 28 |
| 24°F | Jan 27 | Feb 4 | Feb 13 | Feb 19 | Feb 26 | Mar 1 | Mar 6 | Mar 11 | Mar 19 |
| 20°F93% of yrs | Jan 9 | Jan 19 | Jan 27 | Jan 31 | Feb 4 | Feb 12 | Feb 20 | Feb 28 | Mar 7 |
| 16°F66% of yrs | Dec 27 | Jan 6 | Jan 13 | Jan 19 | Jan 25 | Jan 30 | Feb 2 | Feb 11 | Feb 24 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 11 | Oct 16 | Oct 19 | Oct 22 | Oct 25 | Oct 27 | Oct 30 | Nov 2 | Nov 7 |
| 32°F | Oct 20 | Oct 24 | Oct 28 | Oct 31 | Nov 2 | Nov 5 | Nov 9 | Nov 13 | Nov 20 |
| 28°F | Oct 30 | Nov 3 | Nov 6 | Nov 10 | Nov 15 | Nov 19 | Nov 24 | Nov 30 | Dec 6 |
| 24°F | Nov 9 | Nov 15 | Nov 22 | Nov 27 | Dec 1 | Dec 4 | Dec 11 | Dec 25 | Jan 3 |
| 20°F93% of yrs | Nov 25 | Dec 1 | Dec 7 | Dec 18 | Dec 26 | Jan 1 | Jan 4 | Jan 10 | Jan 20 |
| 16°F66% of yrs | Dec 9 | Dec 20 | Dec 29 | Jan 2 | Jan 6 | Jan 11 | Jan 17 | Jan 27 | Feb 6 |
Freeze probabilities 1991–2020 at Newton Exp Stn, MS, 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 39345 →Compare Newton with another place →
Weather by month in Newton
July is the warmest month at Newton Exp Stn, MS, averaging 93°F by day and 69°F at night; January is the coldest at 58°F and 33°F. A freezing night is all but certain in every month from November to February (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 89% of years and April still brings one in 34% of years.
Warmth for growing adds up to 5,780 growing degree days a year (base 50°F), fewer than at 54% of the 96 Mississippi stations. 41% of them (2,352) have built up by the end of June, and July adds the most, 969. Precipitation totals 58.3 inches a year, most in April (6.1") and least in September (3.2"); May to September bring 37% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 58 | 33 | 5.8 | 100% | 17 | 71 |
| Feb | 63 | 36 | 5.5 | 99% | 13 | 99 |
| Mar | 70 | 43 | 5.4 | 89% | 6 | 240 |
| Apr | 77 | 50 | 6.1 | 34% | 1 | 410 |
| May | 84 | 59 | 4.1 | 0% | 0 | 673 |
| Jun | 91 | 67 | 4.9 | 0% | 0 | 859 |
| Jul | 93 | 69 | 4.8 | 0% | 0 | 969 |
| Aug | 93 | 68 | 4.6 | 0% | 0 | 947 |
| Sep | 89 | 62 | 3.2 | 0% | 0 | 769 |
| Oct | 80 | 50 | 3.8 | 43% | 1 | 465 |
| Nov | 68 | 40 | 4.6 | 94% | 9 | 180 |
| Dec | 61 | 36 | 5.5 | 99% | 16 | 99 |
Monthly normals 1991–2020 at Newton Exp Stn, MS (349 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, Newton 5 ENE, MS, 5 miles east of Newton, has a last frost 1 day earlier (March 24), a first frost 3 days later (November 5), a season 6 days longer.
When it snows in Newton, Mississippi
Measurable snow is rare here: only 7 of 28 winters from 1991 to 2020 recorded 0.1 inch or more at Newton Exp Stn, MS, 3.9 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 39345
| When | What to do |
|---|---|
| January 14 – January 28 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| January 28 – February 11 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| February 25 – March 11 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 25 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 10 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 19 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 2 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 39345 is 4 miles from Newton Exp Stn, MS, which stands at 349 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 39345 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.
Frost dates across Mississippi →
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.