Fall in zone 5bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 48740 (Harrisville, MI)
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, Harrisville 2NNE, MI (5 miles away).
- Average last spring frostMay 850% chance of a 32°F freeze after this date
- Average first fall frostOct 1650% chance of a 32°F freeze by this date
- Growing season (frost-free)160 daysmedian, 32°F threshold
- USDA hardiness zone5b-15 to -10°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
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 48740 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-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 26 |
| 50% (the "average" last frost) | May 8 |
| 10% (cautious: only 1 year in 10 freezes later) | May 24 |
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 2 |
| 50% (the "average" first frost) | Oct 16 |
| 90% (late: most years have frozen by now) | Oct 30 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 21 | Oct 4 |
| 32°F (freeze) | May 8 | Oct 16 |
| 28°F (hard freeze) | Apr 27 | Oct 29 |
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 48740
Dates count from your average last spring frost (May 8) and first fall frost (Oct 16). 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 13–27 | May 15–29 (transplant) | – |
| Pepper (sweet and hot) | Feb 27–Mar 13 | May 22–Jun 5 (transplant) | – |
| Eggplant | Feb 27–Mar 13 | May 22–Jun 5 (transplant) | – |
| Tomatillo | Mar 13–27 | May 15–29 (transplant) | – |
| Lettuce | Mar 13–27 | Apr 17–May 8 (transplant) Apr 10–May 22 (sow outdoors) | Aug 21–Sep 11 (transplant) Aug 7–Sep 4 (sowing) |
| Spinach | – | Mar 27–Apr 17 (sow outdoors) | Aug 21–Sep 11 (sowing) |
| Kale | Mar 13–27 | Apr 10–24 (transplant) Apr 10–24 (sow outdoors) | Jul 24–Aug 21 (transplant) Jul 10–Aug 7 (sowing) |
| Collards | Mar 13–27 | Apr 10–May 8 (transplant) Apr 10–May 8 (sow outdoors) | Jul 24–Aug 21 (transplant) Jul 10–Aug 7 (sowing) |
| Broccoli | Feb 27–Mar 13 | Apr 10–24 (transplant) | Jul 10–Aug 7 (transplant) |
| Cabbage | Feb 27–Mar 13 | Apr 10–24 (transplant) | Jul 10–Aug 7 (transplant) |
| Cauliflower | Feb 27–Mar 13 | Apr 24–May 8 (transplant) | Jul 10–Aug 7 (transplant) |
| Brussels sprouts | Feb 13–27 | Apr 10–24 (transplant) | Jun 26–Jul 17 (transplant) |
| Kohlrabi | Mar 13–27 | Apr 10–24 (transplant) Apr 10–24 (sow outdoors) | Aug 7–21 (sowing) |
| Bok choy / Asian greens | – | Apr 10–24 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Arugula | – | Apr 10–May 8 (sow outdoors) | Aug 21–Sep 18 (sowing) |
| Mustard greens | – | Apr 10–May 1 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Swiss chard | Mar 27–Apr 10 | Apr 24–May 15 (transplant) Apr 24–May 22 (sow outdoors) | Aug 7–21 (sowing) |
| Beet | – | Apr 10–May 8 (sow outdoors) | Aug 7–21 (sowing) |
| Carrot | – | Apr 17–May 15 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Radish | – | Apr 3–May 15 (sow outdoors) | Sep 4–18 (sowing) |
| Turnip | – | Apr 10–May 1 (sow outdoors) | Aug 7–21 (sowing) |
| Parsnip | – | Apr 17–May 8 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 13–Apr 10 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Onion (bulbing) | Feb 13–27 | Mar 27–Apr 10 (transplant) | – |
| Green onion / scallion | – | Mar 27–Apr 24 (sow outdoors) | Aug 7–21 (sowing) |
| Leek | Feb 13–27 | Apr 10–24 (transplant) | – |
| Garlic | – | – | Sep 4–Oct 2 (sowing) |
| Shallot | – | Mar 27–Apr 10 (transplant) | Sep 4–Oct 2 (sowing) |
| Potato | – | Apr 10–24 (transplant) | Jun 26–Jul 10 (transplant) |
| Sweet potato | – | May 29–Jun 12 (transplant) | – |
| Sweet corn | – | May 15–29 (sow outdoors) | – |
| Bean, bush (snap) | – | May 15–29 (sow outdoors) | – |
| Bean, pole | – | May 15–29 (sow outdoors) | – |
| Lima bean | – | May 22–Jun 5 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 29–Jun 19 (sow outdoors) | – |
| Cucumber | Apr 10–17 | May 15–29 (transplant) May 15–29 (sow outdoors) | – |
| Summer squash / zucchini | Apr 10–17 | May 15–29 (transplant) May 15–29 (sow outdoors) | – |
| Winter squash | Apr 10–17 | May 15–29 (transplant) May 15–29 (sow outdoors) | – |
| Pumpkin | – | May 15–29 (sow outdoors) | – |
| Watermelon | Apr 10–17 | May 22–Jun 5 (transplant) May 22–Jun 5 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 10–17 | May 22–Jun 5 (transplant) May 22–Jun 5 (sow outdoors) | – |
| Okra | Mar 27–Apr 10 | May 22–Jun 5 (transplant) May 22–Jun 5 (sow outdoors) | – |
| Celery | Feb 13–27 | May 15–22 (transplant) | – |
| Basil | Mar 27–Apr 10 | May 15–29 (transplant) May 15–29 (sow outdoors) | – |
| Cilantro | – | Apr 24–May 22 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Parsley | Feb 27–Mar 13 | Apr 24–May 8 (transplant) Apr 17–May 8 (sow outdoors) | – |
| Dill | – | May 8–22 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Sunflower | – | May 8–22 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 10–24 (transplant) | – |
| Rhubarb (crowns) | – | Apr 10–24 (transplant) | – |
| Strawberry (plants) | – | Apr 10–24 (transplant) | Aug 7–Sep 4 (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: Harrisville 2NNE, MI (NOAA GHCN-Daily ID USC00203628), elevation 585 ft, 4.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Glennie 2SE, MI | 19 mi | May 19 | Sep 29 |
| Hale Loud Dam, MI | 22 mi | May 16 | Oct 5 |
| E Tawas, MI | 27 mi | May 8 | Oct 5 |
The average last-frost dates of these stations span 11 days, a rough guide to local variation. See data sources & methods.
Frost questions for 48740
When is the last frost in 48740?
The average (50% chance) last spring freeze of 32°F for ZIP 48740 is May 8. For a more cautious planting date, use May 24, when only 1 year in 10 still sees a later freeze.
When is the first frost in 48740?
The average first fall freeze is October 16. In 1 year in 10 it comes by October 2.
What hardiness zone is 48740?
ZIP 48740 is in USDA zone 5b (-15 to -10°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 48740 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
48742 Lost Lake Woods 48738 48745 48721 48762 48705 48750 Au Sable 49766 Ossineke
Other ZIP codes in Alcona County
48705 48721 48728 48737 48738 48742 48745 48762 49747 All Alcona County frost dates · Michigan frost dates
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- 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.