Fall in zone 7aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 83604 (Bruneau, 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, Bruneau, ID (11 miles away).
- Average last spring frostApr 1750% chance of a 32°F freeze after this date
- Average first fall frostOct 1750% chance of a 32°F freeze by this date
- Growing season (frost-free)181 daysmedian, 32°F threshold
- USDA hardiness zone7a0 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
60°F 55°F or warmer
24-hour average · latest 57°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Orchard Range Site (43 mi).
4-inch depth
60°F 55°F or warmer
24-hour average · latest 60°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Orchard Range Site (43 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 83604 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 60°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent (annual bluegrass, winter weeds): window open as soil cools through the 70s and 60s.
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) | Mar 31 |
| 50% (the "average" last frost) | Apr 17 |
| 10% (cautious: only 1 year in 10 freezes later) | May 7 |
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 1 |
| 50% (the "average" first frost) | Oct 17 |
| 90% (late: most years have frozen by now) | Nov 1 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 3 | Oct 3 |
| 32°F (freeze) | Apr 17 | Oct 17 |
| 28°F (hard freeze) | Mar 30 | Oct 31 |
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 83604
Dates count from your average last spring frost (Apr 17) and first fall frost (Oct 17). 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 | Feb 20–Mar 6 | Apr 24–May 8 (transplant) | – |
| Pepper (sweet and hot) | Feb 6–20 | May 1–15 (transplant) | – |
| Eggplant | Feb 6–20 | May 1–15 (transplant) | – |
| Tomatillo | Feb 20–Mar 6 | Apr 24–May 8 (transplant) | – |
| Lettuce | Feb 20–Mar 6 | Mar 27–Apr 17 (transplant) Mar 20–May 1 (sow outdoors) | Aug 22–Sep 12 (transplant) Aug 8–Sep 5 (sowing) |
| Spinach | – | Mar 6–27 (sow outdoors) | Aug 22–Sep 12 (sowing) |
| Kale | Feb 20–Mar 6 | Mar 20–Apr 3 (transplant) Mar 20–Apr 3 (sow outdoors) | Jul 25–Aug 22 (transplant) Jul 11–Aug 8 (sowing) |
| Collards | Feb 20–Mar 6 | Mar 20–Apr 17 (transplant) Mar 20–Apr 17 (sow outdoors) | Jul 25–Aug 22 (transplant) Jul 11–Aug 8 (sowing) |
| Broccoli | Feb 6–20 | Mar 20–Apr 3 (transplant) | Jul 11–Aug 8 (transplant) |
| Cabbage | Feb 6–20 | Mar 20–Apr 3 (transplant) | Jul 11–Aug 8 (transplant) |
| Cauliflower | Feb 6–20 | Apr 3–17 (transplant) | Jul 11–Aug 8 (transplant) |
| Brussels sprouts | Jan 23–Feb 6 | Mar 20–Apr 3 (transplant) | Jun 27–Jul 18 (transplant) |
| Kohlrabi | Feb 20–Mar 6 | Mar 20–Apr 3 (transplant) Mar 20–Apr 3 (sow outdoors) | Aug 8–22 (sowing) |
| Bok choy / Asian greens | – | Mar 20–Apr 3 (sow outdoors) | Aug 22–Sep 5 (sowing) |
| Arugula | – | Mar 20–Apr 17 (sow outdoors) | Aug 22–Sep 19 (sowing) |
| Mustard greens | – | Mar 20–Apr 10 (sow outdoors) | Aug 22–Sep 5 (sowing) |
| Swiss chard | Mar 6–20 | Apr 3–24 (transplant) Apr 3–May 1 (sow outdoors) | Aug 8–22 (sowing) |
| Beet | – | Mar 20–Apr 17 (sow outdoors) | Aug 8–22 (sowing) |
| Carrot | – | Mar 27–Apr 24 (sow outdoors) | Jul 25–Aug 8 (sowing) |
| Radish | – | Mar 13–Apr 24 (sow outdoors) | Sep 5–19 (sowing) |
| Turnip | – | Mar 20–Apr 10 (sow outdoors) | Aug 8–22 (sowing) |
| Parsnip | – | Mar 27–Apr 17 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 20–Mar 20 (sow outdoors) | Jul 25–Aug 8 (sowing) |
| Onion (bulbing) | Jan 23–Feb 6 | Mar 6–20 (transplant) | – |
| Green onion / scallion | – | Mar 6–Apr 3 (sow outdoors) | Aug 8–22 (sowing) |
| Leek | Jan 23–Feb 6 | Mar 20–Apr 3 (transplant) | – |
| Garlic | – | – | Sep 5–Oct 3 (sowing) |
| Shallot | – | Mar 6–20 (transplant) | Sep 5–Oct 3 (sowing) |
| Potato | – | Mar 20–Apr 3 (transplant) | Jun 27–Jul 11 (transplant) |
| Sweet potato | – | May 8–22 (transplant) | – |
| Sweet corn | – | Apr 24–May 8 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 24–May 8 (sow outdoors) | – |
| Bean, pole | – | Apr 24–May 8 (sow outdoors) | – |
| Lima bean | – | May 1–15 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 8–29 (sow outdoors) | – |
| Cucumber | Mar 20–27 | Apr 24–May 8 (transplant) Apr 24–May 8 (sow outdoors) | – |
| Summer squash / zucchini | Mar 20–27 | Apr 24–May 8 (transplant) Apr 24–May 8 (sow outdoors) | – |
| Winter squash | Mar 20–27 | Apr 24–May 8 (transplant) Apr 24–May 8 (sow outdoors) | – |
| Pumpkin | – | Apr 24–May 8 (sow outdoors) | – |
| Watermelon | Mar 20–27 | May 1–15 (transplant) May 1–15 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 20–27 | May 1–15 (transplant) May 1–15 (sow outdoors) | – |
| Okra | Mar 6–20 | May 1–15 (transplant) May 1–15 (sow outdoors) | – |
| Celery | Jan 23–Feb 6 | Apr 24–May 1 (transplant) | – |
| Basil | Mar 6–20 | Apr 24–May 8 (transplant) Apr 24–May 8 (sow outdoors) | – |
| Cilantro | – | Apr 3–May 1 (sow outdoors) | Aug 22–Sep 5 (sowing) |
| Parsley | Feb 6–20 | Apr 3–17 (transplant) Mar 27–Apr 17 (sow outdoors) | – |
| Dill | – | Apr 17–May 1 (sow outdoors) | Aug 22–Sep 5 (sowing) |
| Sunflower | – | Apr 17–May 1 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 20–Apr 3 (transplant) | – |
| Rhubarb (crowns) | – | Mar 20–Apr 3 (transplant) | – |
| Strawberry (plants) | – | Mar 20–Apr 3 (transplant) | Aug 8–Sep 5 (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: Bruneau, ID (NOAA GHCN-Daily ID USC00101195), elevation 2,530 ft, 11.1 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Glenns Ferry, ID | 22 mi | May 1 | Oct 3 |
| Mtn Home, ID | 26 mi | May 2 | Oct 8 |
| Grand View 4 NW, ID | 31 mi | Apr 28 | Oct 6 |
The average last-frost dates of these stations span 16 days, a rough guide to local variation. See data sources & methods.
Frost questions for 83604
When is the last frost in 83604?
The average (50% chance) last spring freeze of 32°F for ZIP 83604 is April 17. For a more cautious planting date, use May 7, when only 1 year in 10 still sees a later freeze.
When is the first frost in 83604?
The average first fall freeze is October 17. In 1 year in 10 it comes by October 1.
What hardiness zone is 83604?
ZIP 83604 is in USDA zone 7a (0 to 5°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 83604 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
83627 Hammett 83648 Mountain Home AFB 83623 Glenns Ferry 83624 Grand View 83633 83332 Hagerman 83314 Bliss 83316 Buhl
Other ZIP codes in Owyhee County
83624 83627 83628 83639 83641 83650 All Owyhee 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.