Fall in zone 5bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 84098 (Summit Park, 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, Park City, UT (6 miles away).
- Average last spring frostMay 2950% chance of a 32°F freeze after this date
- Average first fall frostSep 2550% chance of a 32°F freeze by this date
- Growing season (frost-free)117 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
49°F Below 50°F
24-hour average · latest 47°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Morgan (19 mi), Chicken Ridge (42 mi), Buffalo Jump (45 mi).
4-inch depth
49°F Below 50°F
24-hour average · latest 49°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Morgan (19 mi), Chicken Ridge (42 mi), Buffalo Jump (45 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 84098 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 49°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) | May 12 |
| 50% (the "average" last frost) | May 29 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 14 |
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 12 |
| 50% (the "average" first frost) | Sep 25 |
| 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 10 | Sep 15 |
| 32°F (freeze) | May 29 | Sep 25 |
| 28°F (hard freeze) | May 12 | Oct 6 |
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 84098
Dates count from your average last spring frost (May 29) and first fall frost (Sep 25). 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 3–17 | Jun 5–19 (transplant) | – |
| Pepper (sweet and hot) | Mar 20–Apr 3 | Jun 12–26 (transplant) | – |
| Eggplant | Mar 20–Apr 3 | Jun 12–26 (transplant) | – |
| Tomatillo | Apr 3–17 | Jun 5–19 (transplant) | – |
| Lettuce | Apr 3–17 | May 8–29 (transplant) May 1–Jun 12 (sow outdoors) | Jul 31–Aug 21 (transplant) Jul 17–Aug 14 (sowing) |
| Spinach | – | Apr 17–May 8 (sow outdoors) | Jul 31–Aug 21 (sowing) |
| Kale | Apr 3–17 | May 1–15 (transplant) May 1–15 (sow outdoors) | Jul 3–31 (transplant) Jun 19–Jul 17 (sowing) |
| Collards | Apr 3–17 | May 1–29 (transplant) May 1–29 (sow outdoors) | Jul 3–31 (transplant) Jun 19–Jul 17 (sowing) |
| Broccoli | Mar 20–Apr 3 | May 1–15 (transplant) | Jun 19–Jul 17 (transplant) |
| Cabbage | Mar 20–Apr 3 | May 1–15 (transplant) | Jun 19–Jul 17 (transplant) |
| Cauliflower | Mar 20–Apr 3 | May 15–29 (transplant) | Jun 19–Jul 17 (transplant) |
| Brussels sprouts | Mar 6–20 | May 1–15 (transplant) | Jun 5–26 (transplant) |
| Kohlrabi | Apr 3–17 | May 1–15 (transplant) May 1–15 (sow outdoors) | Jul 17–31 (sowing) |
| Bok choy / Asian greens | – | May 1–15 (sow outdoors) | Jul 31–Aug 14 (sowing) |
| Arugula | – | May 1–29 (sow outdoors) | Jul 31–Aug 28 (sowing) |
| Mustard greens | – | May 1–22 (sow outdoors) | Jul 31–Aug 14 (sowing) |
| Swiss chard | Apr 17–May 1 | May 15–Jun 5 (transplant) May 15–Jun 12 (sow outdoors) | Jul 17–31 (sowing) |
| Beet | – | May 1–29 (sow outdoors) | Jul 17–31 (sowing) |
| Carrot | – | May 8–Jun 5 (sow outdoors) | Jul 3–17 (sowing) |
| Radish | – | Apr 24–Jun 5 (sow outdoors) | Aug 14–28 (sowing) |
| Turnip | – | May 1–22 (sow outdoors) | Jul 17–31 (sowing) |
| Parsnip | – | May 8–29 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 3–May 1 (sow outdoors) | Jul 3–17 (sowing) |
| Onion (bulbing) | Mar 6–20 | Apr 17–May 1 (transplant) | – |
| Green onion / scallion | – | Apr 17–May 15 (sow outdoors) | Jul 17–31 (sowing) |
| Leek | Mar 6–20 | May 1–15 (transplant) | – |
| Garlic | – | – | Aug 14–Sep 11 (sowing) |
| Shallot | – | Apr 17–May 1 (transplant) | Aug 14–Sep 11 (sowing) |
| Potato | – | May 1–15 (transplant) | Jun 5–19 (transplant) |
| Sweet potato | – | Jun 19–Jul 3 (transplant) | – |
| Sweet corn | – | Jun 5–19 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 5–19 (sow outdoors) | – |
| Bean, pole | – | Jun 5–19 (sow outdoors) | – |
| Lima bean | – | Jun 12–26 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 19–Jul 10 (sow outdoors) | – |
| Cucumber | May 1–8 | Jun 5–19 (transplant) Jun 5–19 (sow outdoors) | – |
| Summer squash / zucchini | May 1–8 | Jun 5–19 (transplant) Jun 5–19 (sow outdoors) | – |
| Winter squash | May 1–8 | Jun 5–19 (transplant) Jun 5–19 (sow outdoors) | – |
| Pumpkin | – | Jun 5–19 (sow outdoors) | – |
| Watermelon | May 1–8 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 1–8 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Okra | Apr 17–May 1 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Celery | Mar 6–20 | Jun 5–12 (transplant) | – |
| Basil | Apr 17–May 1 | Jun 5–19 (transplant) Jun 5–19 (sow outdoors) | – |
| Cilantro | – | May 15–Jun 12 (sow outdoors) | Jul 31–Aug 14 (sowing) |
| Parsley | Mar 20–Apr 3 | May 15–29 (transplant) May 8–29 (sow outdoors) | – |
| Dill | – | May 29–Jun 12 (sow outdoors) | Jul 31–Aug 14 (sowing) |
| Sunflower | – | May 29–Jun 12 (sow outdoors) | – |
| Asparagus (crowns) | – | May 1–15 (transplant) | – |
| Rhubarb (crowns) | – | May 1–15 (transplant) | – |
| Strawberry (plants) | – | May 1–15 (transplant) | Jul 17–Aug 14 (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: Park City, UT (NOAA GHCN-Daily ID USC00426644), elevation 6,900 ft, 6.5 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Wanship Dam, UT | 7 mi | Jun 11 | Sep 12 |
| Mtn Dell Dam, UT | 10 mi | May 7 | Oct 14 |
| Alta, UT | 12 mi | Jun 11 | Sep 18 |
The average last-frost dates of these stations span 35 days, a rough guide to local variation. See data sources & methods.
Frost questions for 84098
When is the last frost in 84098?
The average (50% chance) last spring freeze of 32°F for ZIP 84098 is May 29. For a more cautious planting date, use June 14, when only 1 year in 10 still sees a later freeze.
When is the first frost in 84098?
The average first fall freeze is September 25. In 1 year in 10 it comes by September 12.
What hardiness zone is 84098?
ZIP 84098 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 84098 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
84060 Park City 84109 Millcreek 84108 Emigration Canyon metro township 84061 Peoa 84121 Brighton 84124 Millcreek 84113 Salt Lake City 84112 Salt Lake City
Other ZIP codes in Summit County
82930 84017 84024 84033 84036 84055 84060 84061 All Summit County frost dates · Utah frost dates
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