Frost dates for ZIP 55702 (St. Louis County, MN)
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, Floodwood 3 NE, MN (11 miles away).
- Average last spring frostMay 2950% chance of a 32°F freeze after this date
- Average first fall frostSep 1850% chance of a 32°F freeze by this date
- Growing season (frost-free)111 daysmedian, 32°F threshold
- USDA hardiness zone4a-30 to -25°F avg. coldest night
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This week in your yard
As of Oct 17, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
49°F Below 50°F
24-hour average · latest 50°F, as of Oct 17, 9:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Sandstone 6 W (61 mi).
4-inch depth
50°F Below 50°F
24-hour average · latest 51°F, as of Oct 17, 9:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Sandstone 6 W (61 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 55702 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 50°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 14 |
| 50% (the "average" last frost) | May 29 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 13 |
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 1 |
| 50% (the "average" first frost) | Sep 18 |
| 90% (late: most years have frozen by now) | Oct 2 |
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) | May 29 | Sep 18 |
| 28°F (hard freeze) | May 16 | Sep 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 55702
Dates count from your average last spring frost (May 29) and first fall frost (Sep 18). 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 3–17 | Jun 5–19 (transplant) | – |
| Pepper (sweet and hot) | Mar 20–Apr 3 | Jun 12–26 (transplant) | – |
| Eggplant | Mar 20–Apr 3 | Jun 12–26 (transplant) | – |
| Tomatillo | Apr 3–17 | Jun 5–19 (transplant) | – |
| Lettuce | Apr 3–17 | May 8–29 (transplant) May 1–Jun 12 (sow outdoors) | Jul 24–Aug 14 (transplant) Jul 10–Aug 7 (sowing) |
| Spinach | – | Apr 17–May 8 (sow outdoors) | Jul 24–Aug 14 (sowing) |
| Kale | Apr 3–17 | May 1–15 (transplant) May 1–15 (sow outdoors) | Jun 26–Jul 24 (transplant) Jun 12–Jul 10 (sowing) |
| Collards | Apr 3–17 | May 1–29 (transplant) May 1–29 (sow outdoors) | Jun 26–Jul 24 (transplant) Jun 12–Jul 10 (sowing) |
| Broccoli | Mar 20–Apr 3 | May 1–15 (transplant) | Jun 12–Jul 10 (transplant) |
| Cabbage | Mar 20–Apr 3 | May 1–15 (transplant) | Jun 12–Jul 10 (transplant) |
| Cauliflower | Mar 20–Apr 3 | May 15–29 (transplant) | Jun 12–Jul 10 (transplant) |
| Brussels sprouts | Mar 6–20 | May 1–15 (transplant) | May 29–Jun 19 (transplant) |
| Kohlrabi | Apr 3–17 | May 1–15 (transplant) May 1–15 (sow outdoors) | Jul 10–24 (sowing) |
| Bok choy / Asian greens | – | May 1–15 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Arugula | – | May 1–29 (sow outdoors) | Jul 24–Aug 21 (sowing) |
| Mustard greens | – | May 1–22 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Swiss chard | Apr 17–May 1 | May 15–Jun 5 (transplant) May 15–Jun 12 (sow outdoors) | Jul 10–24 (sowing) |
| Beet | – | May 1–29 (sow outdoors) | Jul 10–24 (sowing) |
| Carrot | – | May 8–Jun 5 (sow outdoors) | Jun 26–Jul 10 (sowing) |
| Radish | – | Apr 24–Jun 5 (sow outdoors) | Aug 7–21 (sowing) |
| Turnip | – | May 1–22 (sow outdoors) | Jul 10–24 (sowing) |
| Parsnip | – | May 8–29 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 3–May 1 (sow outdoors) | Jun 26–Jul 10 (sowing) |
| Onion (bulbing) | Mar 6–20 | Apr 17–May 1 (transplant) | – |
| Green onion / scallion | – | Apr 17–May 15 (sow outdoors) | Jul 10–24 (sowing) |
| Leek | Mar 6–20 | May 1–15 (transplant) | – |
| Garlic | – | – | Aug 7–Sep 4 (sowing) |
| Shallot | – | Apr 17–May 1 (transplant) | Aug 7–Sep 4 (sowing) |
| Potato | – | May 1–15 (transplant) | May 29–Jun 12 (transplant) |
| Sweet potato | – | Jun 19–Jul 3 (transplant) | – |
| Sweet corn | – | Jun 5–19 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 5–19 (sow outdoors) | – |
| Bean, pole | – | Jun 5–19 (sow outdoors) | – |
| Lima bean | – | Jun 12–26 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 19–Jul 10 (sow outdoors) | – |
| Cucumber | May 1–8 | Jun 5–19 (transplant) Jun 5–19 (sow outdoors) | – |
| Summer squash / zucchini | May 1–8 | Jun 5–19 (transplant) Jun 5–19 (sow outdoors) | – |
| Winter squash | May 1–8 | Jun 5–19 (transplant) Jun 5–19 (sow outdoors) | – |
| Pumpkin | – | Jun 5–19 (sow outdoors) | – |
| Watermelon | May 1–8 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 1–8 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Okra | Apr 17–May 1 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Celery | Mar 6–20 | Jun 5–12 (transplant) | – |
| Basil | Apr 17–May 1 | Jun 5–19 (transplant) Jun 5–19 (sow outdoors) | – |
| Cilantro | – | May 15–Jun 12 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Parsley | Mar 20–Apr 3 | May 15–29 (transplant) May 8–29 (sow outdoors) | – |
| Dill | – | May 29–Jun 12 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Sunflower | – | May 29–Jun 12 (sow outdoors) | – |
| Asparagus (crowns) | – | May 1–15 (transplant) | – |
| Rhubarb (crowns) | – | May 1–15 (transplant) | – |
| Strawberry (plants) | – | May 1–15 (transplant) | Jul 10–Aug 7 (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: Floodwood 3 NE, MN (NOAA GHCN-Daily ID USC00212842), elevation 1,260 ft, 11.0 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Cotton, MN | 17 mi | May 27 | Sep 20 |
| Cloquet, MN | 18 mi | May 26 | Sep 23 |
| Duluth NWS, MN | 22 mi | May 18 | Oct 1 |
The average last-frost dates of these stations span 11 days, a rough guide to local variation. See data sources & methods.
Frost questions for 55702
When is the last frost in 55702?
The average (50% chance) last spring freeze of 32°F for ZIP 55702 is May 29. For a more cautious planting date, use June 13, when only 1 year in 10 still sees a later freeze.
When is the first frost in 55702?
The average first fall freeze is September 18. In 1 year in 10 it comes by September 1.
What hardiness zone is 55702?
ZIP 55702 is in USDA zone 4a (-30 to -25°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 55702 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
55779 55711 Brookston 55765 Meadowlands 55736 Floodwood 55717 55720 Cloquet 55724 55780
Other ZIP codes in St. Louis County
55602 55703 55705 55706 55708 55710 55711 55713 55717 55719 55723 55724 55725 55732 55734 55736 55738 55741 55746 55750 55751 55758 55763 55765 All St. Louis County frost dates · Minnesota frost dates
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