Fall in zone 4aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 56455 (Riverton, 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, Brainerd Crow Wing Co AP, MN (7 miles away).
- Average last spring frostMay 1350% chance of a 32°F freeze after this date
- Average first fall frostSep 2750% chance of a 32°F freeze by this date
- Growing season (frost-free)138 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 18, 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 49°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Sandstone 6 W (53 mi).
4-inch depth
50°F Below 50°F
24-hour average · latest 50°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Sandstone 6 W (53 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 56455 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) | Apr 29 |
| 50% (the "average" last frost) | May 13 |
| 10% (cautious: only 1 year in 10 freezes later) | May 27 |
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 14 |
| 50% (the "average" first frost) | Sep 27 |
| 90% (late: most years have frozen by now) | Oct 12 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 24 | Sep 19 |
| 32°F (freeze) | May 13 | Sep 27 |
| 28°F (hard freeze) | May 2 | Oct 8 |
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 56455
Dates count from your average last spring frost (May 13) and first fall frost (Sep 27). 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 18–Apr 1 | May 20–Jun 3 (transplant) | – |
| Pepper (sweet and hot) | Mar 4–18 | May 27–Jun 10 (transplant) | – |
| Eggplant | Mar 4–18 | May 27–Jun 10 (transplant) | – |
| Tomatillo | Mar 18–Apr 1 | May 20–Jun 3 (transplant) | – |
| Lettuce | Mar 18–Apr 1 | Apr 22–May 13 (transplant) Apr 15–May 27 (sow outdoors) | Aug 2–23 (transplant) Jul 19–Aug 16 (sowing) |
| Spinach | – | Apr 1–22 (sow outdoors) | Aug 2–23 (sowing) |
| Kale | Mar 18–Apr 1 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | Jul 5–Aug 2 (transplant) Jun 21–Jul 19 (sowing) |
| Collards | Mar 18–Apr 1 | Apr 15–May 13 (transplant) Apr 15–May 13 (sow outdoors) | Jul 5–Aug 2 (transplant) Jun 21–Jul 19 (sowing) |
| Broccoli | Mar 4–18 | Apr 15–29 (transplant) | Jun 21–Jul 19 (transplant) |
| Cabbage | Mar 4–18 | Apr 15–29 (transplant) | Jun 21–Jul 19 (transplant) |
| Cauliflower | Mar 4–18 | Apr 29–May 13 (transplant) | Jun 21–Jul 19 (transplant) |
| Brussels sprouts | Feb 18–Mar 4 | Apr 15–29 (transplant) | Jun 7–28 (transplant) |
| Kohlrabi | Mar 18–Apr 1 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Bok choy / Asian greens | – | Apr 15–29 (sow outdoors) | Aug 2–16 (sowing) |
| Arugula | – | Apr 15–May 13 (sow outdoors) | Aug 2–30 (sowing) |
| Mustard greens | – | Apr 15–May 6 (sow outdoors) | Aug 2–16 (sowing) |
| Swiss chard | Apr 1–15 | Apr 29–May 20 (transplant) Apr 29–May 27 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Beet | – | Apr 15–May 13 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Carrot | – | Apr 22–May 20 (sow outdoors) | Jul 5–19 (sowing) |
| Radish | – | Apr 8–May 20 (sow outdoors) | Aug 16–30 (sowing) |
| Turnip | – | Apr 15–May 6 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Parsnip | – | Apr 22–May 13 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 18–Apr 15 (sow outdoors) | Jul 5–19 (sowing) |
| Onion (bulbing) | Feb 18–Mar 4 | Apr 1–15 (transplant) | – |
| Green onion / scallion | – | Apr 1–29 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Leek | Feb 18–Mar 4 | Apr 15–29 (transplant) | – |
| Garlic | – | – | Aug 16–Sep 13 (sowing) |
| Shallot | – | Apr 1–15 (transplant) | Aug 16–Sep 13 (sowing) |
| Potato | – | Apr 15–29 (transplant) | Jun 7–21 (transplant) |
| Sweet potato | – | Jun 3–17 (transplant) | – |
| Sweet corn | – | May 20–Jun 3 (sow outdoors) | – |
| Bean, bush (snap) | – | May 20–Jun 3 (sow outdoors) | – |
| Bean, pole | – | May 20–Jun 3 (sow outdoors) | – |
| Lima bean | – | May 27–Jun 10 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 3–24 (sow outdoors) | – |
| Cucumber | Apr 15–22 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Summer squash / zucchini | Apr 15–22 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Winter squash | Apr 15–22 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Pumpkin | – | May 20–Jun 3 (sow outdoors) | – |
| Watermelon | Apr 15–22 | May 27–Jun 10 (transplant) May 27–Jun 10 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 15–22 | May 27–Jun 10 (transplant) May 27–Jun 10 (sow outdoors) | – |
| Okra | Apr 1–15 | May 27–Jun 10 (transplant) May 27–Jun 10 (sow outdoors) | – |
| Celery | Feb 18–Mar 4 | May 20–27 (transplant) | – |
| Basil | Apr 1–15 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Cilantro | – | Apr 29–May 27 (sow outdoors) | Aug 2–16 (sowing) |
| Parsley | Mar 4–18 | Apr 29–May 13 (transplant) Apr 22–May 13 (sow outdoors) | – |
| Dill | – | May 13–27 (sow outdoors) | Aug 2–16 (sowing) |
| Sunflower | – | May 13–27 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 15–29 (transplant) | – |
| Rhubarb (crowns) | – | Apr 15–29 (transplant) | – |
| Strawberry (plants) | – | Apr 15–29 (transplant) | Jul 19–Aug 16 (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: Brainerd Crow Wing Co AP, MN (NOAA GHCN-Daily ID USW00094938), elevation 1,221 ft, 6.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Brainerd, MN | 12 mi | May 8 | Sep 29 |
| Pine Rvr Dam, MN | 17 mi | May 6 | Oct 7 |
| Aitkin 2E, MN | 17 mi | May 16 | Sep 28 |
The average last-frost dates of these stations span 10 days, a rough guide to local variation. See data sources & methods.
Frost questions for 56455
When is the last frost in 56455?
The average (50% chance) last spring freeze of 32°F for ZIP 56455 is May 13. For a more cautious planting date, use May 27, when only 1 year in 10 still sees a later freeze.
When is the first frost in 56455?
The average first fall freeze is September 27. In 1 year in 10 it comes by September 14.
What hardiness zone is 56455?
ZIP 56455 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 56455 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
56444 Cuyuna 56465 Merrifield 56441 Trommald 56401 Brainerd 56425 Baxter 56468 Lake Shore 56450 Garrison 56442 Crosslake
Other ZIP codes in Crow Wing County
56401 56425 56441 56442 56444 56447 56448 56449 56450 56465 56468 All Crow Wing County frost dates · Minnesota 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.