Fall in zone 6aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 83349 (Richfield, ID)
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, Richfield, ID (5 miles away).
- Average last spring frostMay 2450% chance of a 32°F freeze after this date
- Average first fall frostSep 2650% chance of a 32°F freeze by this date
- Growing season (frost-free)123 daysmedian, 32°F threshold
- USDA hardiness zone6a-10 to -5°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
46°F Below 50°F
24-hour average · latest 47°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Arco 17 SW (40 mi).
4-inch depth
48°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 Arco 17 SW (40 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 83349 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 mid-May).
Fertilizer window
Lawn region: Mountain West and High Plains. 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 6 |
| 50% (the "average" last frost) | May 24 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 14 |
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 10 |
| 50% (the "average" first frost) | Sep 26 |
| 90% (late: most years have frozen by now) | Oct 10 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Jun 11 | Sep 14 |
| 32°F (freeze) | May 24 | Sep 26 |
| 28°F (hard freeze) | May 8 | Oct 7 |
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 83349
Dates count from your average last spring frost (May 24) and first fall frost (Sep 26). 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 29–Apr 12 | May 31–Jun 14 (transplant) | – |
| Pepper (sweet and hot) | Mar 15–29 | Jun 7–21 (transplant) | – |
| Eggplant | Mar 15–29 | Jun 7–21 (transplant) | – |
| Tomatillo | Mar 29–Apr 12 | May 31–Jun 14 (transplant) | – |
| Lettuce | Mar 29–Apr 12 | May 3–24 (transplant) Apr 26–Jun 7 (sow outdoors) | Aug 1–22 (transplant) Jul 18–Aug 15 (sowing) |
| Spinach | – | Apr 12–May 3 (sow outdoors) | Aug 1–22 (sowing) |
| Kale | Mar 29–Apr 12 | Apr 26–May 10 (transplant) Apr 26–May 10 (sow outdoors) | Jul 4–Aug 1 (transplant) Jun 20–Jul 18 (sowing) |
| Collards | Mar 29–Apr 12 | Apr 26–May 24 (transplant) Apr 26–May 24 (sow outdoors) | Jul 4–Aug 1 (transplant) Jun 20–Jul 18 (sowing) |
| Broccoli | Mar 15–29 | Apr 26–May 10 (transplant) | Jun 20–Jul 18 (transplant) |
| Cabbage | Mar 15–29 | Apr 26–May 10 (transplant) | Jun 20–Jul 18 (transplant) |
| Cauliflower | Mar 15–29 | May 10–24 (transplant) | Jun 20–Jul 18 (transplant) |
| Brussels sprouts | Mar 1–15 | Apr 26–May 10 (transplant) | Jun 6–27 (transplant) |
| Kohlrabi | Mar 29–Apr 12 | Apr 26–May 10 (transplant) Apr 26–May 10 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Bok choy / Asian greens | – | Apr 26–May 10 (sow outdoors) | Aug 1–15 (sowing) |
| Arugula | – | Apr 26–May 24 (sow outdoors) | Aug 1–29 (sowing) |
| Mustard greens | – | Apr 26–May 17 (sow outdoors) | Aug 1–15 (sowing) |
| Swiss chard | Apr 12–26 | May 10–31 (transplant) May 10–Jun 7 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Beet | – | Apr 26–May 24 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Carrot | – | May 3–31 (sow outdoors) | Jul 4–18 (sowing) |
| Radish | – | Apr 19–May 31 (sow outdoors) | Aug 15–29 (sowing) |
| Turnip | – | Apr 26–May 17 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Parsnip | – | May 3–24 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 29–Apr 26 (sow outdoors) | Jul 4–18 (sowing) |
| Onion (bulbing) | Mar 1–15 | Apr 12–26 (transplant) | – |
| Green onion / scallion | – | Apr 12–May 10 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Leek | Mar 1–15 | Apr 26–May 10 (transplant) | – |
| Garlic | – | – | Aug 15–Sep 12 (sowing) |
| Shallot | – | Apr 12–26 (transplant) | Aug 15–Sep 12 (sowing) |
| Potato | – | Apr 26–May 10 (transplant) | Jun 6–20 (transplant) |
| Sweet potato | – | Jun 14–28 (transplant) | – |
| Sweet corn | – | May 31–Jun 14 (sow outdoors) | – |
| Bean, bush (snap) | – | May 31–Jun 14 (sow outdoors) | – |
| Bean, pole | – | May 31–Jun 14 (sow outdoors) | – |
| Lima bean | – | Jun 7–21 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 14–Jul 5 (sow outdoors) | – |
| Cucumber | Apr 26–May 3 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Summer squash / zucchini | Apr 26–May 3 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Winter squash | Apr 26–May 3 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Pumpkin | – | May 31–Jun 14 (sow outdoors) | – |
| Watermelon | Apr 26–May 3 | Jun 7–21 (transplant) Jun 7–21 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 26–May 3 | Jun 7–21 (transplant) Jun 7–21 (sow outdoors) | – |
| Okra | Apr 12–26 | Jun 7–21 (transplant) Jun 7–21 (sow outdoors) | – |
| Celery | Mar 1–15 | May 31–Jun 7 (transplant) | – |
| Basil | Apr 12–26 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Cilantro | – | May 10–Jun 7 (sow outdoors) | Aug 1–15 (sowing) |
| Parsley | Mar 15–29 | May 10–24 (transplant) May 3–24 (sow outdoors) | – |
| Dill | – | May 24–Jun 7 (sow outdoors) | Aug 1–15 (sowing) |
| Sunflower | – | May 24–Jun 7 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 26–May 10 (transplant) | – |
| Rhubarb (crowns) | – | Apr 26–May 10 (transplant) | – |
| Strawberry (plants) | – | Apr 26–May 10 (transplant) | Jul 18–Aug 15 (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: Richfield, ID (NOAA GHCN-Daily ID USC00107673), elevation 4,309 ft, 4.6 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Picabo, ID | 15 mi | Jun 16 | Sep 9 |
| Shoshone 1 WNW, ID | 16 mi | Apr 24 | Oct 16 |
| Bellevue, ID | 25 mi | May 13 | Oct 2 |
The average last-frost dates of these stations span 54 days, a rough guide to local variation. See data sources & methods.
Frost questions for 83349
When is the last frost in 83349?
The average (50% chance) last spring freeze of 32°F for ZIP 83349 is May 24. For a more cautious planting date, use June 14, when only 1 year in 10 still sees a later freeze.
When is the first frost in 83349?
The average first fall freeze is September 26. In 1 year in 10 it comes by September 10.
What hardiness zone is 83349?
ZIP 83349 is in USDA zone 6a (-10 to -5°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 83349 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
83352 Shoshone 83348 83313 Gannett 83324 Dietrich 83320 Carey 83330 Gooding 83338 Jerome 83333 Hailey
Other ZIP codes in Lincoln County
83324 83352 All Lincoln County frost dates · Idaho 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.