Fall in zone 4bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 49815 (Dickinson County, 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, Clarksburg, MI (22 miles away).
- Average last spring frostJun 550% chance of a 32°F freeze after this date
- Average first fall frostSep 1050% chance of a 32°F freeze by this date
- Growing season (frost-free)96 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
48°F Below 50°F
24-hour average · latest 47°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Chatham 1 SE (50 mi), Wabeno #1 (58 mi).
4-inch depth
48°F Below 50°F
24-hour average · latest 48°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Chatham 1 SE (50 mi), Wabeno #1 (58 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 49815 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 48°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) | May 23 |
| 50% (the "average" last frost) | Jun 5 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 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) | Aug 23 |
| 50% (the "average" first frost) | Sep 10 |
| 90% (late: most years have frozen by now) | Oct 1 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | n/a | n/a |
| 32°F (freeze) | Jun 5 | Sep 10 |
| 28°F (hard freeze) | May 23 | Sep 28 |
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 49815
Dates count from your average last spring frost (Jun 5) and first fall frost (Sep 10). 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 | Apr 10–24 | Jun 12–26 (transplant) | – |
| Pepper (sweet and hot) | Mar 27–Apr 10 | Jun 19–Jul 3 (transplant) | – |
| Eggplant | Mar 27–Apr 10 | Jun 19–Jul 3 (transplant) | – |
| Tomatillo | Apr 10–24 | Jun 12–26 (transplant) | – |
| Lettuce | Apr 10–24 | May 15–Jun 5 (transplant) May 8–Jun 19 (sow outdoors) | Jul 16–Aug 6 (transplant) Jul 2–30 (sowing) |
| Spinach | – | Apr 24–May 15 (sow outdoors) | Jul 16–Aug 6 (sowing) |
| Kale | Apr 10–24 | May 8–22 (transplant) May 8–22 (sow outdoors) | Jun 18–Jul 16 (transplant) Jun 4–Jul 2 (sowing) |
| Collards | Apr 10–24 | May 8–Jun 5 (transplant) May 8–Jun 5 (sow outdoors) | Jun 18–Jul 16 (transplant) |
| Broccoli | Mar 27–Apr 10 | May 8–22 (transplant) | Jun 4–Jul 2 (transplant) |
| Cabbage | Mar 27–Apr 10 | May 8–22 (transplant) | Jun 4–Jul 2 (transplant) |
| Cauliflower | Mar 27–Apr 10 | May 22–Jun 5 (transplant) | – |
| Brussels sprouts | Mar 13–27 | May 8–22 (transplant) | – |
| Kohlrabi | Apr 10–24 | May 8–22 (transplant) May 8–22 (sow outdoors) | Jul 2–16 (sowing) |
| Bok choy / Asian greens | – | May 8–22 (sow outdoors) | Jul 16–30 (sowing) |
| Arugula | – | May 8–Jun 5 (sow outdoors) | Jul 16–Aug 13 (sowing) |
| Mustard greens | – | May 8–29 (sow outdoors) | Jul 16–30 (sowing) |
| Swiss chard | Apr 24–May 8 | May 22–Jun 12 (transplant) May 22–Jun 19 (sow outdoors) | Jul 2–16 (sowing) |
| Beet | – | May 8–Jun 5 (sow outdoors) | Jul 2–16 (sowing) |
| Carrot | – | May 15–Jun 12 (sow outdoors) | Jun 18–Jul 2 (sowing) |
| Radish | – | May 1–Jun 12 (sow outdoors) | Jul 30–Aug 13 (sowing) |
| Turnip | – | May 8–29 (sow outdoors) | Jul 2–16 (sowing) |
| Parsnip | – | May 15–Jun 5 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 10–May 8 (sow outdoors) | Jun 18–Jul 2 (sowing) |
| Onion (bulbing) | Mar 13–27 | Apr 24–May 8 (transplant) | – |
| Green onion / scallion | – | Apr 24–May 22 (sow outdoors) | Jul 2–16 (sowing) |
| Leek | Mar 13–27 | May 8–22 (transplant) | – |
| Garlic | – | – | Jul 30–Aug 27 (sowing) |
| Shallot | – | Apr 24–May 8 (transplant) | Jul 30–Aug 27 (sowing) |
| Potato | – | May 8–22 (transplant) | – |
| Sweet potato | – | Jun 26–Jul 10 (transplant) | – |
| Sweet corn | – | Jun 12–26 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 12–26 (sow outdoors) | – |
| Bean, pole | – | Jun 12–26 (sow outdoors) | – |
| Lima bean | – | Jun 19–Jul 3 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 26–Jul 17 (sow outdoors) | – |
| Cucumber | May 8–15 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Summer squash / zucchini | May 8–15 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Winter squash | May 8–15 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Pumpkin | – | Jun 12–26 (sow outdoors) | – |
| Watermelon | May 8–15 | Jun 19–Jul 3 (transplant) Jun 19–Jul 3 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 8–15 | Jun 19–Jul 3 (transplant) Jun 19–Jul 3 (sow outdoors) | – |
| Okra | Apr 24–May 8 | Jun 19–Jul 3 (transplant) Jun 19–Jul 3 (sow outdoors) | – |
| Celery | Mar 13–27 | Jun 12–19 (transplant) | – |
| Basil | Apr 24–May 8 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Cilantro | – | May 22–Jun 19 (sow outdoors) | Jul 16–30 (sowing) |
| Parsley | Mar 27–Apr 10 | May 22–Jun 5 (transplant) May 15–Jun 5 (sow outdoors) | – |
| Dill | – | Jun 5–19 (sow outdoors) | Jul 16–30 (sowing) |
| Sunflower | – | Jun 5–19 (sow outdoors) | – |
| Asparagus (crowns) | – | May 8–22 (transplant) | – |
| Rhubarb (crowns) | – | May 8–22 (transplant) | – |
| Strawberry (plants) | – | May 8–22 (transplant) | Jul 2–30 (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: Clarksburg, MI (NOAA GHCN-Daily ID USC00201435), elevation 1,554 ft, 22.0 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Florence, WI | 23 mi | May 24 | Sep 25 |
| Ishpeming Wwtp, MI | 24 mi | May 26 | Sep 25 |
| Amasa 1W, MI | 24 mi | Jun 6 | Sep 9 |
The average last-frost dates of these stations span 13 days, a rough guide to local variation. See data sources & methods.
Frost questions for 49815
When is the last frost in 49815?
The average (50% chance) last spring freeze of 32°F for ZIP 49815 is June 5. For a more cautious planting date, use June 24, when only 1 year in 10 still sees a later freeze.
When is the first frost in 49815?
The average first fall freeze is September 10. In 1 year in 10 it comes by August 23.
What hardiness zone is 49815?
ZIP 49815 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 49815 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
49881 49877 49879 Republic 49831 49920 Crystal Falls 49801 Iron Mountain 49849 Ishpeming 49834
Other ZIP codes in Dickinson County
49801 49802 49831 49834 49852 49870 49876 49877 49881 49892 All Dickinson County frost dates · Michigan 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.