Fall in zone 4bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 57345 (Highmore, SD)
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, Highmore 1 W, SD (4 miles away).
- Average last spring frostMay 1250% chance of a 32°F freeze after this date
- Average first fall frostOct 150% chance of a 32°F freeze by this date
- Growing season (frost-free)142 daysmedian, 32°F threshold
- USDA hardiness zone4b-25 to -20°F avg. coldest night
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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
51°F 50–55°F
24-hour average · latest 53°F, as of Oct 17, 11:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Pierre 24 S (59 mi).
4-inch depth
53°F 50–55°F
24-hour average · latest 54°F, as of Oct 17, 11:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Pierre 24 S (59 mi).
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 57345 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 53°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent window is mostly past. Next: spring, when soil reaches 50°F (typically mid-April to early May).
Fertilizer window
Lawn region: North (cool-season). Timing only; always follow the product label.
- Kentucky bluegrass (cool-season): Early fall: Around Labor Day (late August–September); Late fall: Late October–November, before the ground freezes; Late spring: Optional around Memorial Day. Avoid: Early-spring and midsummer feeding (pushes top growth, favors crabgrass).
Plant now
No vegetable planting windows are open this week.
Prune now
No frost-timed pruning windows are open this week.
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) | Apr 28 |
| 50% (the "average" last frost) | May 12 |
| 10% (cautious: only 1 year in 10 freezes later) | May 28 |
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) | Sep 17 |
| 50% (the "average" first frost) | Oct 1 |
| 90% (late: most years have frozen by now) | Oct 14 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 21 | Sep 22 |
| 32°F (freeze) | May 12 | Oct 1 |
| 28°F (hard freeze) | May 2 | Oct 10 |
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 57345
Dates count from your average last spring frost (May 12) and first fall frost (Oct 1). 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 | Mar 17–31 | May 19–Jun 2 (transplant) | – |
| Pepper (sweet and hot) | Mar 3–17 | May 26–Jun 9 (transplant) | – |
| Eggplant | Mar 3–17 | May 26–Jun 9 (transplant) | – |
| Tomatillo | Mar 17–31 | May 19–Jun 2 (transplant) | – |
| Lettuce | Mar 17–31 | Apr 21–May 12 (transplant) Apr 14–May 26 (sow outdoors) | Aug 6–27 (transplant) Jul 23–Aug 20 (sowing) |
| Spinach | – | Mar 31–Apr 21 (sow outdoors) | Aug 6–27 (sowing) |
| Kale | Mar 17–31 | Apr 14–28 (transplant) Apr 14–28 (sow outdoors) | Jul 9–Aug 6 (transplant) Jun 25–Jul 23 (sowing) |
| Collards | Mar 17–31 | Apr 14–May 12 (transplant) Apr 14–May 12 (sow outdoors) | Jul 9–Aug 6 (transplant) Jun 25–Jul 23 (sowing) |
| Broccoli | Mar 3–17 | Apr 14–28 (transplant) | Jun 25–Jul 23 (transplant) |
| Cabbage | Mar 3–17 | Apr 14–28 (transplant) | Jun 25–Jul 23 (transplant) |
| Cauliflower | Mar 3–17 | Apr 28–May 12 (transplant) | Jun 25–Jul 23 (transplant) |
| Brussels sprouts | Feb 17–Mar 3 | Apr 14–28 (transplant) | Jun 11–Jul 2 (transplant) |
| Kohlrabi | Mar 17–31 | Apr 14–28 (transplant) Apr 14–28 (sow outdoors) | Jul 23–Aug 6 (sowing) |
| Bok choy / Asian greens | – | Apr 14–28 (sow outdoors) | Aug 6–20 (sowing) |
| Arugula | – | Apr 14–May 12 (sow outdoors) | Aug 6–Sep 3 (sowing) |
| Mustard greens | – | Apr 14–May 5 (sow outdoors) | Aug 6–20 (sowing) |
| Swiss chard | Mar 31–Apr 14 | Apr 28–May 19 (transplant) Apr 28–May 26 (sow outdoors) | Jul 23–Aug 6 (sowing) |
| Beet | – | Apr 14–May 12 (sow outdoors) | Jul 23–Aug 6 (sowing) |
| Carrot | – | Apr 21–May 19 (sow outdoors) | Jul 9–23 (sowing) |
| Radish | – | Apr 7–May 19 (sow outdoors) | Aug 20–Sep 3 (sowing) |
| Turnip | – | Apr 14–May 5 (sow outdoors) | Jul 23–Aug 6 (sowing) |
| Parsnip | – | Apr 21–May 12 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 17–Apr 14 (sow outdoors) | Jul 9–23 (sowing) |
| Onion (bulbing) | Feb 17–Mar 3 | Mar 31–Apr 14 (transplant) | – |
| Green onion / scallion | – | Mar 31–Apr 28 (sow outdoors) | Jul 23–Aug 6 (sowing) |
| Leek | Feb 17–Mar 3 | Apr 14–28 (transplant) | – |
| Garlic | – | – | Aug 20–Sep 17 (sowing) |
| Shallot | – | Mar 31–Apr 14 (transplant) | Aug 20–Sep 17 (sowing) |
| Potato | – | Apr 14–28 (transplant) | Jun 11–25 (transplant) |
| Sweet potato | – | Jun 2–16 (transplant) | – |
| Sweet corn | – | May 19–Jun 2 (sow outdoors) | – |
| Bean, bush (snap) | – | May 19–Jun 2 (sow outdoors) | – |
| Bean, pole | – | May 19–Jun 2 (sow outdoors) | – |
| Lima bean | – | May 26–Jun 9 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 2–23 (sow outdoors) | – |
| Cucumber | Apr 14–21 | May 19–Jun 2 (transplant) May 19–Jun 2 (sow outdoors) | – |
| Summer squash / zucchini | Apr 14–21 | May 19–Jun 2 (transplant) May 19–Jun 2 (sow outdoors) | – |
| Winter squash | Apr 14–21 | May 19–Jun 2 (transplant) May 19–Jun 2 (sow outdoors) | – |
| Pumpkin | – | May 19–Jun 2 (sow outdoors) | – |
| Watermelon | Apr 14–21 | May 26–Jun 9 (transplant) May 26–Jun 9 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 14–21 | May 26–Jun 9 (transplant) May 26–Jun 9 (sow outdoors) | – |
| Okra | Mar 31–Apr 14 | May 26–Jun 9 (transplant) May 26–Jun 9 (sow outdoors) | – |
| Celery | Feb 17–Mar 3 | May 19–26 (transplant) | – |
| Basil | Mar 31–Apr 14 | May 19–Jun 2 (transplant) May 19–Jun 2 (sow outdoors) | – |
| Cilantro | – | Apr 28–May 26 (sow outdoors) | Aug 6–20 (sowing) |
| Parsley | Mar 3–17 | Apr 28–May 12 (transplant) Apr 21–May 12 (sow outdoors) | – |
| Dill | – | May 12–26 (sow outdoors) | Aug 6–20 (sowing) |
| Sunflower | – | May 12–26 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 14–28 (transplant) | – |
| Rhubarb (crowns) | – | Apr 14–28 (transplant) | – |
| Strawberry (plants) | – | Apr 14–28 (transplant) | Jul 23–Aug 20 (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.
Where these numbers come from
Station: Highmore 1 W, SD (NOAA GHCN-Daily ID USC00393832), elevation 1,888 ft, 3.9 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Highmore 23 N, SD | 19 mi | May 14 | Sep 29 |
| Stephan 2 NW, SD | 22 mi | May 10 | Sep 29 |
| Harrold 12 SSW, SD | 23 mi | May 17 | Sep 24 |
The average last-frost dates of these stations span 7 days, a rough guide to local variation. See data sources & methods.
Frost questions for 57345
When is the last frost in 57345?
The average (50% chance) last spring freeze of 32°F for ZIP 57345 is May 12. For a more cautious planting date, use May 28, when only 1 year in 10 still sees a later freeze.
When is the first frost in 57345?
The average first fall freeze is October 1. In 1 year in 10 it comes by September 17.
What hardiness zone is 57345?
ZIP 57345 is in USDA zone 4b (-25 to -20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 57345 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
57540 57371 Ree Heights 57536 Harrold 57362 Miller 57467 Orient 57346 Stephan 57522 Blunt 57373 St. Lawrence
Other ZIP codes in Hyde County
57346 57540 All Hyde County frost dates · South Dakota frost dates
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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.