Frost dates for ZIP 84302 (Brigham City, UT)
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, Brigham City Waste Plt, UT (4 miles away).
- Average last spring frostMay 550% chance of a 32°F freeze after this date
- Average first fall frostOct 550% chance of a 32°F freeze by this date
- Growing season (frost-free)150 daysmedian, 32°F threshold
- USDA hardiness zone6b-5 to 0°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
50°F 50–55°F
24-hour average · latest 53°F, as of Oct 17, 10:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Cache Junction (16 mi), Brigham City 28 WNW (25 mi), Blue Creek (31 mi).
4-inch depth
51°F 50–55°F
24-hour average · latest 53°F, as of Oct 17, 10:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Cache Junction (16 mi), Brigham City 28 WNW (25 mi), Blue Creek (31 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 84302 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 51°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) | Apr 20 |
| 50% (the "average" last frost) | May 5 |
| 10% (cautious: only 1 year in 10 freezes later) | May 29 |
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 20 |
| 50% (the "average" first frost) | Oct 5 |
| 90% (late: most years have frozen by now) | Oct 19 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 23 | Sep 24 |
| 32°F (freeze) | May 5 | Oct 5 |
| 28°F (hard freeze) | Apr 18 | Oct 17 |
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 84302
Dates count from your average last spring frost (May 5) and first fall frost (Oct 5). 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 10–24 | May 12–26 (transplant) | – |
| Pepper (sweet and hot) | Feb 24–Mar 10 | May 19–Jun 2 (transplant) | – |
| Eggplant | Feb 24–Mar 10 | May 19–Jun 2 (transplant) | – |
| Tomatillo | Mar 10–24 | May 12–26 (transplant) | – |
| Lettuce | Mar 10–24 | Apr 14–May 5 (transplant) Apr 7–May 19 (sow outdoors) | Aug 10–31 (transplant) Jul 27–Aug 24 (sowing) |
| Spinach | – | Mar 24–Apr 14 (sow outdoors) | Aug 10–31 (sowing) |
| Kale | Mar 10–24 | Apr 7–21 (transplant) Apr 7–21 (sow outdoors) | Jul 13–Aug 10 (transplant) Jun 29–Jul 27 (sowing) |
| Collards | Mar 10–24 | Apr 7–May 5 (transplant) Apr 7–May 5 (sow outdoors) | Jul 13–Aug 10 (transplant) Jun 29–Jul 27 (sowing) |
| Broccoli | Feb 24–Mar 10 | Apr 7–21 (transplant) | Jun 29–Jul 27 (transplant) |
| Cabbage | Feb 24–Mar 10 | Apr 7–21 (transplant) | Jun 29–Jul 27 (transplant) |
| Cauliflower | Feb 24–Mar 10 | Apr 21–May 5 (transplant) | Jun 29–Jul 27 (transplant) |
| Brussels sprouts | Feb 10–24 | Apr 7–21 (transplant) | Jun 15–Jul 6 (transplant) |
| Kohlrabi | Mar 10–24 | Apr 7–21 (transplant) Apr 7–21 (sow outdoors) | Jul 27–Aug 10 (sowing) |
| Bok choy / Asian greens | – | Apr 7–21 (sow outdoors) | Aug 10–24 (sowing) |
| Arugula | – | Apr 7–May 5 (sow outdoors) | Aug 10–Sep 7 (sowing) |
| Mustard greens | – | Apr 7–28 (sow outdoors) | Aug 10–24 (sowing) |
| Swiss chard | Mar 24–Apr 7 | Apr 21–May 12 (transplant) Apr 21–May 19 (sow outdoors) | Jul 27–Aug 10 (sowing) |
| Beet | – | Apr 7–May 5 (sow outdoors) | Jul 27–Aug 10 (sowing) |
| Carrot | – | Apr 14–May 12 (sow outdoors) | Jul 13–27 (sowing) |
| Radish | – | Mar 31–May 12 (sow outdoors) | Aug 24–Sep 7 (sowing) |
| Turnip | – | Apr 7–28 (sow outdoors) | Jul 27–Aug 10 (sowing) |
| Parsnip | – | Apr 14–May 5 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 10–Apr 7 (sow outdoors) | Jul 13–27 (sowing) |
| Onion (bulbing) | Feb 10–24 | Mar 24–Apr 7 (transplant) | – |
| Green onion / scallion | – | Mar 24–Apr 21 (sow outdoors) | Jul 27–Aug 10 (sowing) |
| Leek | Feb 10–24 | Apr 7–21 (transplant) | – |
| Garlic | – | – | Aug 24–Sep 21 (sowing) |
| Shallot | – | Mar 24–Apr 7 (transplant) | Aug 24–Sep 21 (sowing) |
| Potato | – | Apr 7–21 (transplant) | Jun 15–29 (transplant) |
| Sweet potato | – | May 26–Jun 9 (transplant) | – |
| Sweet corn | – | May 12–26 (sow outdoors) | – |
| Bean, bush (snap) | – | May 12–26 (sow outdoors) | – |
| Bean, pole | – | May 12–26 (sow outdoors) | – |
| Lima bean | – | May 19–Jun 2 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 26–Jun 16 (sow outdoors) | – |
| Cucumber | Apr 7–14 | May 12–26 (transplant) May 12–26 (sow outdoors) | – |
| Summer squash / zucchini | Apr 7–14 | May 12–26 (transplant) May 12–26 (sow outdoors) | – |
| Winter squash | Apr 7–14 | May 12–26 (transplant) May 12–26 (sow outdoors) | – |
| Pumpkin | – | May 12–26 (sow outdoors) | – |
| Watermelon | Apr 7–14 | May 19–Jun 2 (transplant) May 19–Jun 2 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 7–14 | May 19–Jun 2 (transplant) May 19–Jun 2 (sow outdoors) | – |
| Okra | Mar 24–Apr 7 | May 19–Jun 2 (transplant) May 19–Jun 2 (sow outdoors) | – |
| Celery | Feb 10–24 | May 12–19 (transplant) | – |
| Basil | Mar 24–Apr 7 | May 12–26 (transplant) May 12–26 (sow outdoors) | – |
| Cilantro | – | Apr 21–May 19 (sow outdoors) | Aug 10–24 (sowing) |
| Parsley | Feb 24–Mar 10 | Apr 21–May 5 (transplant) Apr 14–May 5 (sow outdoors) | – |
| Dill | – | May 5–19 (sow outdoors) | Aug 10–24 (sowing) |
| Sunflower | – | May 5–19 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 7–21 (transplant) | – |
| Rhubarb (crowns) | – | Apr 7–21 (transplant) | – |
| Strawberry (plants) | – | Apr 7–21 (transplant) | Jul 27–Aug 24 (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: Brigham City Waste Plt, UT (NOAA GHCN-Daily ID USC00420928), elevation 4,240 ft, 4.2 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Logan 5 SW EXP Farm, UT | 10 mi | May 12 | Sep 28 |
| Tremonton, UT | 10 mi | Apr 24 | Oct 17 |
| Logan Radio Kvnu, UT | 14 mi | May 8 | Oct 2 |
The average last-frost dates of these stations span 19 days, a rough guide to local variation. See data sources & methods.
Frost questions for 84302
When is the last frost in 84302?
The average (50% chance) last spring freeze of 32°F for ZIP 84302 is May 5. For a more cautious planting date, use May 29, when only 1 year in 10 still sees a later freeze.
When is the first frost in 84302?
The average first fall freeze is October 5. In 1 year in 10 it comes by September 20.
What hardiness zone is 84302?
ZIP 84302 is in USDA zone 6b (-5 to 0°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 84302 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
84301 Bear River City 84314 Honeyville 84339 Wellsville 84324 Mantua 84309 Deweyville 84325 Peter 84328 Avon 84326 Millville
Other ZIP codes in Box Elder County
84301 84306 84307 84309 84311 84312 84313 84314 84316 84324 84329 84330 84331 84334 84336 84337 84340 All Box Elder County frost dates · Utah frost dates
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