Fall in zone 6aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 84521 (Elmo, 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, Wellington 3 E, UT (10 miles away).
- Average last spring frostMay 2750% 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)122 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
54°F 50–55°F
24-hour average · latest 50°F, as of Oct 18, 2:00 AM CDT
Measured at USDA NRCS SCAN station Price, 8 mi away. Daily averages: Thu 53°, Fri 54°, Sat 54°.
4-inch depth
53°F 50–55°F
24-hour average · latest 52°F, as of Oct 18, 2:00 AM CDT
Measured at USDA NRCS SCAN station Price, 8 mi away. Daily averages: Thu 52°, Fri 53°, Sat 53°.
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 84521 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 53°F at 4 inches. 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 11 |
| 50% (the "average" last frost) | May 27 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 11 |
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 11 |
| 50% (the "average" first frost) | Sep 26 |
| 90% (late: most years have frozen by now) | Oct 9 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Jun 12 | Sep 17 |
| 32°F (freeze) | May 27 | Sep 26 |
| 28°F (hard freeze) | May 9 | Oct 5 |
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 84521
Dates count from your average last spring frost (May 27) 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 | Apr 1–15 | Jun 3–17 (transplant) | – |
| Pepper (sweet and hot) | Mar 18–Apr 1 | Jun 10–24 (transplant) | – |
| Eggplant | Mar 18–Apr 1 | Jun 10–24 (transplant) | – |
| Tomatillo | Apr 1–15 | Jun 3–17 (transplant) | – |
| Lettuce | Apr 1–15 | May 6–27 (transplant) Apr 29–Jun 10 (sow outdoors) | Aug 1–22 (transplant) Jul 18–Aug 15 (sowing) |
| Spinach | – | Apr 15–May 6 (sow outdoors) | Aug 1–22 (sowing) |
| Kale | Apr 1–15 | Apr 29–May 13 (transplant) Apr 29–May 13 (sow outdoors) | Jul 4–Aug 1 (transplant) Jun 20–Jul 18 (sowing) |
| Collards | Apr 1–15 | Apr 29–May 27 (transplant) Apr 29–May 27 (sow outdoors) | Jul 4–Aug 1 (transplant) Jun 20–Jul 18 (sowing) |
| Broccoli | Mar 18–Apr 1 | Apr 29–May 13 (transplant) | Jun 20–Jul 18 (transplant) |
| Cabbage | Mar 18–Apr 1 | Apr 29–May 13 (transplant) | Jun 20–Jul 18 (transplant) |
| Cauliflower | Mar 18–Apr 1 | May 13–27 (transplant) | Jun 20–Jul 18 (transplant) |
| Brussels sprouts | Mar 4–18 | Apr 29–May 13 (transplant) | Jun 6–27 (transplant) |
| Kohlrabi | Apr 1–15 | Apr 29–May 13 (transplant) Apr 29–May 13 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Bok choy / Asian greens | – | Apr 29–May 13 (sow outdoors) | Aug 1–15 (sowing) |
| Arugula | – | Apr 29–May 27 (sow outdoors) | Aug 1–29 (sowing) |
| Mustard greens | – | Apr 29–May 20 (sow outdoors) | Aug 1–15 (sowing) |
| Swiss chard | Apr 15–29 | May 13–Jun 3 (transplant) May 13–Jun 10 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Beet | – | Apr 29–May 27 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Carrot | – | May 6–Jun 3 (sow outdoors) | Jul 4–18 (sowing) |
| Radish | – | Apr 22–Jun 3 (sow outdoors) | Aug 15–29 (sowing) |
| Turnip | – | Apr 29–May 20 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Parsnip | – | May 6–27 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 1–29 (sow outdoors) | Jul 4–18 (sowing) |
| Onion (bulbing) | Mar 4–18 | Apr 15–29 (transplant) | – |
| Green onion / scallion | – | Apr 15–May 13 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Leek | Mar 4–18 | Apr 29–May 13 (transplant) | – |
| Garlic | – | – | Aug 15–Sep 12 (sowing) |
| Shallot | – | Apr 15–29 (transplant) | Aug 15–Sep 12 (sowing) |
| Potato | – | Apr 29–May 13 (transplant) | Jun 6–20 (transplant) |
| Sweet potato | – | Jun 17–Jul 1 (transplant) | – |
| Sweet corn | – | Jun 3–17 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 3–17 (sow outdoors) | – |
| Bean, pole | – | Jun 3–17 (sow outdoors) | – |
| Lima bean | – | Jun 10–24 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 17–Jul 8 (sow outdoors) | – |
| Cucumber | Apr 29–May 6 | Jun 3–17 (transplant) Jun 3–17 (sow outdoors) | – |
| Summer squash / zucchini | Apr 29–May 6 | Jun 3–17 (transplant) Jun 3–17 (sow outdoors) | – |
| Winter squash | Apr 29–May 6 | Jun 3–17 (transplant) Jun 3–17 (sow outdoors) | – |
| Pumpkin | – | Jun 3–17 (sow outdoors) | – |
| Watermelon | Apr 29–May 6 | Jun 10–24 (transplant) Jun 10–24 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 29–May 6 | Jun 10–24 (transplant) Jun 10–24 (sow outdoors) | – |
| Okra | Apr 15–29 | Jun 10–24 (transplant) Jun 10–24 (sow outdoors) | – |
| Celery | Mar 4–18 | Jun 3–10 (transplant) | – |
| Basil | Apr 15–29 | Jun 3–17 (transplant) Jun 3–17 (sow outdoors) | – |
| Cilantro | – | May 13–Jun 10 (sow outdoors) | Aug 1–15 (sowing) |
| Parsley | Mar 18–Apr 1 | May 13–27 (transplant) May 6–27 (sow outdoors) | – |
| Dill | – | May 27–Jun 10 (sow outdoors) | Aug 1–15 (sowing) |
| Sunflower | – | May 27–Jun 10 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 29–May 13 (transplant) | – |
| Rhubarb (crowns) | – | Apr 29–May 13 (transplant) | – |
| Strawberry (plants) | – | Apr 29–May 13 (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: Wellington 3 E, UT (NOAA GHCN-Daily ID USC00429368), elevation 5,400 ft, 9.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Price Carbon Co AP, UT | 13 mi | May 3 | Oct 12 |
| Castle Dale, UT | 20 mi | May 18 | Sep 27 |
| Sunnyside City, UT | 22 mi | Apr 26 | Oct 25 |
The average last-frost dates of these stations span 32 days, a rough guide to local variation. See data sources & methods.
Frost questions for 84521
When is the last frost in 84521?
The average (50% chance) last spring freeze of 32°F for ZIP 84521 is May 27. For a more cautious planting date, use June 11, when only 1 year in 10 still sees a later freeze.
When is the first frost in 84521?
The average first fall freeze is September 26. In 1 year in 10 it comes by September 11.
What hardiness zone is 84521?
ZIP 84521 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 84521 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
84518 Cleveland 84501 Price 84528 Huntington 84513 Castle Dale 84520 East Carbon 84529 Kenilworth 84526 Spring Glen 84539 East Carbon
Other ZIP codes in Emery County
84513 84516 84518 84522 84523 84525 84528 84537 All Emery County frost dates · Utah frost dates
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Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
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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.