Fall in zone 8bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 39421 (Bassfield, MS)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Collins, MS (14 miles away).
- Average last spring frostMar 1750% chance of a 32°F freeze after this date
- Average first fall frostNov 1250% chance of a 32°F freeze by this date
- Growing season (frost-free)238 daysmedian, 32°F threshold
- USDA hardiness zone8b15 to 20°F avg. coldest night
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Frost and freeze alerts from the NWS forecast for 39421, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
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This week in your yard
As of Oct 18, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
No soil station with a fresh reading within 62 miles.
4-inch depth
No soil station with a fresh reading within 62 miles.
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 39421 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
No soil reading near this ZIP. Typical extension timing for your region: spring mid-February to early March; fall September to early October.
Fertilizer window
Lawn region: Southeast (warm, humid). Timing only; always follow the product label.
- Centipedegrass (warm-season): Spring: Not before mid-May (NC State); after full green-up (about May 2 here, using green-up about 3–4 weeks after your average last frost); Summer: Optional mid-summer feeding, especially on sandy coastal soils. Avoid: Early-spring feeding, frequent feeding and liming unless a soil test calls for it (centipede decline).
Plant now
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 12: skip heavy pruning in the 6–8 weeks before it, because new growth may not harden off in time.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Feb 28 |
| 50% (the "average" last frost) | Mar 17 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 4 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Oct 30 |
| 50% (the "average" first frost) | Nov 12 |
| 90% (late: most years have frozen by now) | Dec 1 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 1 | Nov 2 |
| 32°F (freeze) | Mar 17 | Nov 12 |
| 28°F (hard freeze) | Mar 4 | Nov 26 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 39421
Dates count from your average last spring frost (Mar 17) and first fall frost (Nov 12). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Jan 20–Feb 3 | Mar 24–Apr 7 (transplant) | Jul 16–Aug 13 (transplant) |
| Pepper (sweet and hot) | Jan 6–20 | Mar 31–Apr 14 (transplant) | Jul 23–Aug 13 (transplant) |
| Eggplant | Jan 6–20 | Mar 31–Apr 14 (transplant) | Jul 23–Aug 13 (transplant) |
| Tomatillo | Jan 20–Feb 3 | Mar 24–Apr 7 (transplant) | – |
| Lettuce | Jan 20–Feb 3 | Feb 24–Mar 17 (transplant) Feb 17–Mar 31 (sow outdoors) | Sep 17–Oct 8 (transplant) Sep 3–Oct 1 (sowing) |
| Spinach | – | Feb 3–24 (sow outdoors) | Sep 17–Oct 8 (sowing) |
| Kale | Jan 20–Feb 3 | Feb 17–Mar 3 (transplant) Feb 17–Mar 3 (sow outdoors) | Aug 20–Sep 17 (transplant) Aug 6–Sep 3 (sowing) |
| Collards | Jan 20–Feb 3 | Feb 17–Mar 17 (transplant) Feb 17–Mar 17 (sow outdoors) | Aug 20–Sep 17 (transplant) Aug 6–Sep 3 (sowing) |
| Broccoli | Jan 6–20 | Feb 17–Mar 3 (transplant) | Aug 6–Sep 3 (transplant) |
| Cabbage | Jan 6–20 | Feb 17–Mar 3 (transplant) | Aug 6–Sep 3 (transplant) |
| Cauliflower | Jan 6–20 | Mar 3–17 (transplant) | Aug 6–Sep 3 (transplant) |
| Brussels sprouts | Dec 23–Jan 6 | Feb 17–Mar 3 (transplant) | Jul 23–Aug 13 (transplant) |
| Kohlrabi | Jan 20–Feb 3 | Feb 17–Mar 3 (transplant) Feb 17–Mar 3 (sow outdoors) | Sep 3–17 (sowing) |
| Bok choy / Asian greens | – | Feb 17–Mar 3 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Arugula | – | Feb 17–Mar 17 (sow outdoors) | Sep 17–Oct 15 (sowing) |
| Mustard greens | – | Feb 17–Mar 10 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Swiss chard | Feb 3–17 | Mar 3–24 (transplant) Mar 3–31 (sow outdoors) | Sep 3–17 (sowing) |
| Beet | – | Feb 17–Mar 17 (sow outdoors) | Sep 3–17 (sowing) |
| Carrot | – | Feb 24–Mar 24 (sow outdoors) | Aug 20–Sep 3 (sowing) |
| Radish | – | Feb 10–Mar 24 (sow outdoors) | Oct 1–15 (sowing) |
| Turnip | – | Feb 17–Mar 10 (sow outdoors) | Sep 3–17 (sowing) |
| Parsnip | – | Feb 24–Mar 17 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Jan 20–Feb 17 (sow outdoors) | Aug 20–Sep 3 (sowing) |
| Onion (bulbing) | Dec 23–Jan 6 | Feb 3–17 (transplant) | – |
| Green onion / scallion | – | Feb 3–Mar 3 (sow outdoors) | Sep 3–17 (sowing) |
| Leek | Dec 23–Jan 6 | Feb 17–Mar 3 (transplant) | – |
| Garlic | – | – | Oct 1–29 (sowing) |
| Shallot | – | Feb 3–17 (transplant) | Oct 1–29 (sowing) |
| Potato | – | Feb 17–Mar 3 (transplant) | Jul 23–Aug 6 (transplant) |
| Sweet potato | – | Apr 7–21 (transplant) | – |
| Sweet corn | – | Mar 24–Apr 7 (sow outdoors) | – |
| Bean, bush (snap) | – | Mar 24–Apr 7 (sow outdoors) | Aug 20–Sep 3 (sowing) |
| Bean, pole | – | Mar 24–Apr 7 (sow outdoors) | – |
| Lima bean | – | Mar 31–Apr 14 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 7–28 (sow outdoors) | – |
| Cucumber | Feb 17–24 | Mar 24–Apr 7 (transplant) Mar 24–Apr 7 (sow outdoors) | Aug 20–Sep 3 (sowing) |
| Summer squash / zucchini | Feb 17–24 | Mar 24–Apr 7 (transplant) Mar 24–Apr 7 (sow outdoors) | Aug 20–Sep 3 (sowing) |
| Winter squash | Feb 17–24 | Mar 24–Apr 7 (transplant) Mar 24–Apr 7 (sow outdoors) | – |
| Pumpkin | – | Mar 24–Apr 7 (sow outdoors) | – |
| Watermelon | Feb 17–24 | Mar 31–Apr 14 (transplant) Mar 31–Apr 14 (sow outdoors) | – |
| Cantaloupe / muskmelon | Feb 17–24 | Mar 31–Apr 14 (transplant) Mar 31–Apr 14 (sow outdoors) | – |
| Okra | Feb 3–17 | Mar 31–Apr 14 (transplant) Mar 31–Apr 14 (sow outdoors) | – |
| Celery | Dec 23–Jan 6 | Mar 24–31 (transplant) | – |
| Basil | Feb 3–17 | Mar 24–Apr 7 (transplant) Mar 24–Apr 7 (sow outdoors) | – |
| Cilantro | – | Mar 3–31 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Parsley | Jan 6–20 | Mar 3–17 (transplant) Feb 24–Mar 17 (sow outdoors) | – |
| Dill | – | Mar 17–31 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Sunflower | – | Mar 17–31 (sow outdoors) | – |
| Asparagus (crowns) | – | Feb 17–Mar 3 (transplant) | – |
| Rhubarb (crowns) | – | Feb 17–Mar 3 (transplant) | – |
| Strawberry (plants) | – | Feb 17–Mar 3 (transplant) | Sep 3–Oct 1 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Plants that do well here
Mississippi has a university or garden plant program: Mississippi Medallion. Plant frost-tender annuals after March 17 here (the average last frost). Not affiliated with the program.
Where these numbers come from
Station: Collins, MS (NOAA GHCN-Daily ID USC00221852), elevation 290 ft, 14.2 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Columbia, MS | 18 mi | Mar 5 | Nov 19 |
| Monticello, MS | 23 mi | Mar 12 | Nov 10 |
| Hattiesburg 5SW, MS | 28 mi | Mar 7 | Nov 23 |
The average last-frost dates of these stations span 12 days, a rough guide to local variation. See data sources & methods.
Frost questions for 39421
When is the last frost in 39421?
The average (50% chance) last spring freeze of 32°F for ZIP 39421 is March 17. For a more cautious planting date, use April 4, when only 1 year in 10 still sees a later freeze.
When is the first frost in 39421?
The average first fall freeze is November 12. In 1 year in 10 it comes by October 30.
What hardiness zone is 39421?
ZIP 39421 is in USDA zone 8b (15 to 20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 39421 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
39427 39482 Sumrall 39474 Prentiss 39656 39428 Collins 39479 Seminary 39429 Columbia 39119 Mount Olive
Other ZIP codes in Jefferson Davis County
39140 39427 39474 39656 All Jefferson Davis County frost dates · Mississippi frost dates
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Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
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Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.