Fall in zone 6aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 84018 (Morgan County, 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, Huntsville Monastery, UT (14 miles away).
- Average last spring frostJun 450% chance of a 32°F freeze after this date
- Average first fall frostSep 1650% chance of a 32°F freeze by this date
- Growing season (frost-free)102 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
45°F Below 50°F
24-hour average · latest 45°F, as of Oct 18, 2:00 AM CDT
Measured at USDA NRCS SCAN station Chicken Ridge, 11 mi away. Daily averages: Thu 44°, Fri 45°, Sat 45°.
4-inch depth
46°F Below 50°F
24-hour average · latest 46°F, as of Oct 18, 2:00 AM CDT
Measured at USDA NRCS SCAN station Chicken Ridge, 11 mi away. Daily averages: Thu 45°, Fri 45°, Sat 46°.
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 84018 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 46°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 15 |
| 50% (the "average" last frost) | Jun 4 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 22 |
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 1 |
| 50% (the "average" first frost) | Sep 16 |
| 90% (late: most years have frozen by now) | Oct 1 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | n/a | n/a |
| 32°F (freeze) | Jun 4 | Sep 16 |
| 28°F (hard freeze) | May 13 | Sep 28 |
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 84018
Dates count from your average last spring frost (Jun 4) and first fall frost (Sep 16). 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 9–23 | Jun 11–25 (transplant) | – |
| Pepper (sweet and hot) | Mar 26–Apr 9 | Jun 18–Jul 2 (transplant) | – |
| Eggplant | Mar 26–Apr 9 | Jun 18–Jul 2 (transplant) | – |
| Tomatillo | Apr 9–23 | Jun 11–25 (transplant) | – |
| Lettuce | Apr 9–23 | May 14–Jun 4 (transplant) May 7–Jun 18 (sow outdoors) | Jul 22–Aug 12 (transplant) Jul 8–Aug 5 (sowing) |
| Spinach | – | Apr 23–May 14 (sow outdoors) | Jul 22–Aug 12 (sowing) |
| Kale | Apr 9–23 | May 7–21 (transplant) May 7–21 (sow outdoors) | Jun 24–Jul 22 (transplant) Jun 10–Jul 8 (sowing) |
| Collards | Apr 9–23 | May 7–Jun 4 (transplant) May 7–Jun 4 (sow outdoors) | Jun 24–Jul 22 (transplant) Jun 10–Jul 8 (sowing) |
| Broccoli | Mar 26–Apr 9 | May 7–21 (transplant) | Jun 10–Jul 8 (transplant) |
| Cabbage | Mar 26–Apr 9 | May 7–21 (transplant) | Jun 10–Jul 8 (transplant) |
| Cauliflower | Mar 26–Apr 9 | May 21–Jun 4 (transplant) | Jun 10–Jul 8 (transplant) |
| Brussels sprouts | Mar 12–26 | May 7–21 (transplant) | May 27–Jun 17 (transplant) |
| Kohlrabi | Apr 9–23 | May 7–21 (transplant) May 7–21 (sow outdoors) | Jul 8–22 (sowing) |
| Bok choy / Asian greens | – | May 7–21 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Arugula | – | May 7–Jun 4 (sow outdoors) | Jul 22–Aug 19 (sowing) |
| Mustard greens | – | May 7–28 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Swiss chard | Apr 23–May 7 | May 21–Jun 11 (transplant) May 21–Jun 18 (sow outdoors) | Jul 8–22 (sowing) |
| Beet | – | May 7–Jun 4 (sow outdoors) | Jul 8–22 (sowing) |
| Carrot | – | May 14–Jun 11 (sow outdoors) | Jun 24–Jul 8 (sowing) |
| Radish | – | Apr 30–Jun 11 (sow outdoors) | Aug 5–19 (sowing) |
| Turnip | – | May 7–28 (sow outdoors) | Jul 8–22 (sowing) |
| Parsnip | – | May 14–Jun 4 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 9–May 7 (sow outdoors) | Jun 24–Jul 8 (sowing) |
| Onion (bulbing) | Mar 12–26 | Apr 23–May 7 (transplant) | – |
| Green onion / scallion | – | Apr 23–May 21 (sow outdoors) | Jul 8–22 (sowing) |
| Leek | Mar 12–26 | May 7–21 (transplant) | – |
| Garlic | – | – | Aug 5–Sep 2 (sowing) |
| Shallot | – | Apr 23–May 7 (transplant) | Aug 5–Sep 2 (sowing) |
| Potato | – | May 7–21 (transplant) | May 27–Jun 10 (transplant) |
| Sweet potato | – | Jun 25–Jul 9 (transplant) | – |
| Sweet corn | – | Jun 11–25 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 11–25 (sow outdoors) | – |
| Bean, pole | – | Jun 11–25 (sow outdoors) | – |
| Lima bean | – | Jun 18–Jul 2 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 25–Jul 16 (sow outdoors) | – |
| Cucumber | May 7–14 | Jun 11–25 (transplant) Jun 11–25 (sow outdoors) | – |
| Summer squash / zucchini | May 7–14 | Jun 11–25 (transplant) Jun 11–25 (sow outdoors) | – |
| Winter squash | May 7–14 | Jun 11–25 (transplant) Jun 11–25 (sow outdoors) | – |
| Pumpkin | – | Jun 11–25 (sow outdoors) | – |
| Watermelon | May 7–14 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 7–14 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Okra | Apr 23–May 7 | Jun 18–Jul 2 (transplant) Jun 18–Jul 2 (sow outdoors) | – |
| Celery | Mar 12–26 | Jun 11–18 (transplant) | – |
| Basil | Apr 23–May 7 | Jun 11–25 (transplant) Jun 11–25 (sow outdoors) | – |
| Cilantro | – | May 21–Jun 18 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Parsley | Mar 26–Apr 9 | May 21–Jun 4 (transplant) May 14–Jun 4 (sow outdoors) | – |
| Dill | – | Jun 4–18 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Sunflower | – | Jun 4–18 (sow outdoors) | – |
| Asparagus (crowns) | – | May 7–21 (transplant) | – |
| Rhubarb (crowns) | – | May 7–21 (transplant) | – |
| Strawberry (plants) | – | May 7–21 (transplant) | Jul 8–Aug 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: Huntsville Monastery, UT (NOAA GHCN-Daily ID USC00424135), elevation 5,140 ft, 13.8 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Morgan, UT | 17 mi | May 25 | Sep 24 |
| Echo Dam, UT | 18 mi | May 30 | Sep 18 |
| Pineview Dam, UT | 20 mi | May 22 | Sep 26 |
The average last-frost dates of these stations span 13 days, a rough guide to local variation. See data sources & methods.
Frost questions for 84018
When is the last frost in 84018?
The average (50% chance) last spring freeze of 32°F for ZIP 84018 is June 4. For a more cautious planting date, use June 22, when only 1 year in 10 still sees a later freeze.
When is the first frost in 84018?
The average first fall freeze is September 16. In 1 year in 10 it comes by September 1.
What hardiness zone is 84018?
ZIP 84018 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 84018 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
84317 Huntsville 84024 Echo 84033 Henefer 84050 Mountain Green 84086 Woodruff 84017 Coalville 84310 Liberty 84403 Ogden
Other ZIP codes in Morgan County
84050 All Morgan 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.