Fall in zone 5bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 84078 (Naples, 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, Vernal Municipal AP, UT (2 miles away).
- Average last spring frostMay 650% chance of a 32°F freeze after this date
- Average first fall frostOct 750% chance of a 32°F freeze by this date
- Growing season (frost-free)153 daysmedian, 32°F threshold
- USDA hardiness zone5b-15 to -10°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
47°F Below 50°F
24-hour average · latest 45°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Dinosaur 2 E (32 mi), Little Red Fox (46 mi), Mountain Home (48 mi).
4-inch depth
48°F Below 50°F
24-hour average · latest 48°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Dinosaur 2 E (32 mi), Little Red Fox (46 mi), Mountain Home (48 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 84078 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) | Apr 21 |
| 50% (the "average" last frost) | May 6 |
| 10% (cautious: only 1 year in 10 freezes later) | May 25 |
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 25 |
| 50% (the "average" first frost) | Oct 7 |
| 90% (late: most years have frozen by now) | Oct 20 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 21 | Sep 28 |
| 32°F (freeze) | May 6 | Oct 7 |
| 28°F (hard freeze) | Apr 23 | Oct 19 |
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 84078
Dates count from your average last spring frost (May 6) and first fall frost (Oct 7). 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 11–25 | May 13–27 (transplant) | – |
| Pepper (sweet and hot) | Feb 25–Mar 11 | May 20–Jun 3 (transplant) | – |
| Eggplant | Feb 25–Mar 11 | May 20–Jun 3 (transplant) | – |
| Tomatillo | Mar 11–25 | May 13–27 (transplant) | – |
| Lettuce | Mar 11–25 | Apr 15–May 6 (transplant) Apr 8–May 20 (sow outdoors) | Aug 12–Sep 2 (transplant) Jul 29–Aug 26 (sowing) |
| Spinach | – | Mar 25–Apr 15 (sow outdoors) | Aug 12–Sep 2 (sowing) |
| Kale | Mar 11–25 | Apr 8–22 (transplant) Apr 8–22 (sow outdoors) | Jul 15–Aug 12 (transplant) Jul 1–29 (sowing) |
| Collards | Mar 11–25 | Apr 8–May 6 (transplant) Apr 8–May 6 (sow outdoors) | Jul 15–Aug 12 (transplant) Jul 1–29 (sowing) |
| Broccoli | Feb 25–Mar 11 | Apr 8–22 (transplant) | Jul 1–29 (transplant) |
| Cabbage | Feb 25–Mar 11 | Apr 8–22 (transplant) | Jul 1–29 (transplant) |
| Cauliflower | Feb 25–Mar 11 | Apr 22–May 6 (transplant) | Jul 1–29 (transplant) |
| Brussels sprouts | Feb 11–25 | Apr 8–22 (transplant) | Jun 17–Jul 8 (transplant) |
| Kohlrabi | Mar 11–25 | Apr 8–22 (transplant) Apr 8–22 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Bok choy / Asian greens | – | Apr 8–22 (sow outdoors) | Aug 12–26 (sowing) |
| Arugula | – | Apr 8–May 6 (sow outdoors) | Aug 12–Sep 9 (sowing) |
| Mustard greens | – | Apr 8–29 (sow outdoors) | Aug 12–26 (sowing) |
| Swiss chard | Mar 25–Apr 8 | Apr 22–May 13 (transplant) Apr 22–May 20 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Beet | – | Apr 8–May 6 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Carrot | – | Apr 15–May 13 (sow outdoors) | Jul 15–29 (sowing) |
| Radish | – | Apr 1–May 13 (sow outdoors) | Aug 26–Sep 9 (sowing) |
| Turnip | – | Apr 8–29 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Parsnip | – | Apr 15–May 6 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 11–Apr 8 (sow outdoors) | Jul 15–29 (sowing) |
| Onion (bulbing) | Feb 11–25 | Mar 25–Apr 8 (transplant) | – |
| Green onion / scallion | – | Mar 25–Apr 22 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Leek | Feb 11–25 | Apr 8–22 (transplant) | – |
| Garlic | – | – | Aug 26–Sep 23 (sowing) |
| Shallot | – | Mar 25–Apr 8 (transplant) | Aug 26–Sep 23 (sowing) |
| Potato | – | Apr 8–22 (transplant) | Jun 17–Jul 1 (transplant) |
| Sweet potato | – | May 27–Jun 10 (transplant) | – |
| Sweet corn | – | May 13–27 (sow outdoors) | – |
| Bean, bush (snap) | – | May 13–27 (sow outdoors) | – |
| Bean, pole | – | May 13–27 (sow outdoors) | – |
| Lima bean | – | May 20–Jun 3 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 27–Jun 17 (sow outdoors) | – |
| Cucumber | Apr 8–15 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Summer squash / zucchini | Apr 8–15 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Winter squash | Apr 8–15 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Pumpkin | – | May 13–27 (sow outdoors) | – |
| Watermelon | Apr 8–15 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 8–15 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Okra | Mar 25–Apr 8 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Celery | Feb 11–25 | May 13–20 (transplant) | – |
| Basil | Mar 25–Apr 8 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Cilantro | – | Apr 22–May 20 (sow outdoors) | Aug 12–26 (sowing) |
| Parsley | Feb 25–Mar 11 | Apr 22–May 6 (transplant) Apr 15–May 6 (sow outdoors) | – |
| Dill | – | May 6–20 (sow outdoors) | Aug 12–26 (sowing) |
| Sunflower | – | May 6–20 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 8–22 (transplant) | – |
| Rhubarb (crowns) | – | Apr 8–22 (transplant) | – |
| Strawberry (plants) | – | Apr 8–22 (transplant) | Jul 29–Aug 26 (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: Vernal Municipal AP, UT (NOAA GHCN-Daily ID USW00094030), elevation 5,260 ft, 1.6 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Vernal, UT | 2 mi | May 7 | Oct 6 |
| Maeser 9NW, UT | 10 mi | May 15 | Oct 5 |
| Dinosaur Nm-quarry Area, UT | 11 mi | May 1 | Oct 6 |
The average last-frost dates of these stations span 14 days, a rough guide to local variation. See data sources & methods.
Frost questions for 84078
When is the last frost in 84078?
The average (50% chance) last spring freeze of 32°F for ZIP 84078 is May 6. For a more cautious planting date, use May 25, when only 1 year in 10 still sees a later freeze.
When is the first frost in 84078?
The average first fall freeze is October 7. In 1 year in 10 it comes by September 25.
What hardiness zone is 84078?
ZIP 84078 is in USDA zone 5b (-15 to -10°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 84078 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
84035 Jensen 84039 Lapoint 84076 84063 Randlett 84026 Fort Duchesne 84085 Whiterocks 84053 Neola 84066 Ballard
Other ZIP codes in Uintah County
84008 84026 84035 84039 84063 84076 84085 All Uintah County frost dates · Utah frost dates
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