Frost dates for ZIP 84102 (Salt Lake 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, Salt Lake Triad Ctr, UT (2 miles away).
- Average last spring frostMar 3150% chance of a 32°F freeze after this date
- Average first fall frostNov 850% chance of a 32°F freeze by this date
- Growing season (frost-free)224 daysmedian, 32°F threshold
- USDA hardiness zone7b5 to 10°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 52°F, as of Oct 17, 10:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Morgan (19 mi), Grantsville (30 mi), Chicken Ridge (49 mi).
4-inch depth
51°F 50–55°F
24-hour average · latest 54°F, as of Oct 17, 10:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Morgan (19 mi), Grantsville (30 mi), Chicken Ridge (49 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 84102 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
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 8: skip heavy pruning in the 6–8 weeks before it, because new growth may not harden off in time.
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) | Mar 7 |
| 50% (the "average" last frost) | Mar 31 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 19 |
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) | Oct 23 |
| 50% (the "average" first frost) | Nov 8 |
| 90% (late: most years have frozen by now) | Nov 25 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 18 | Oct 28 |
| 32°F (freeze) | Mar 31 | Nov 8 |
| 28°F (hard freeze) | Mar 8 | Nov 18 |
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 84102
Dates count from your average last spring frost (Mar 31) and first fall frost (Nov 8). 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 | Feb 3–17 | Apr 7–21 (transplant) | Jul 12–Aug 9 (transplant) |
| Pepper (sweet and hot) | Jan 20–Feb 3 | Apr 14–28 (transplant) | Jul 19–Aug 9 (transplant) |
| Eggplant | Jan 20–Feb 3 | Apr 14–28 (transplant) | Jul 19–Aug 9 (transplant) |
| Tomatillo | Feb 3–17 | Apr 7–21 (transplant) | – |
| Lettuce | Feb 3–17 | Mar 10–31 (transplant) Mar 3–Apr 14 (sow outdoors) | Sep 13–Oct 4 (transplant) Aug 30–Sep 27 (sowing) |
| Spinach | – | Feb 17–Mar 10 (sow outdoors) | Sep 13–Oct 4 (sowing) |
| Kale | Feb 3–17 | Mar 3–17 (transplant) Mar 3–17 (sow outdoors) | Aug 16–Sep 13 (transplant) Aug 2–30 (sowing) |
| Collards | Feb 3–17 | Mar 3–31 (transplant) Mar 3–31 (sow outdoors) | Aug 16–Sep 13 (transplant) Aug 2–30 (sowing) |
| Broccoli | Jan 20–Feb 3 | Mar 3–17 (transplant) | Aug 2–30 (transplant) |
| Cabbage | Jan 20–Feb 3 | Mar 3–17 (transplant) | Aug 2–30 (transplant) |
| Cauliflower | Jan 20–Feb 3 | Mar 17–31 (transplant) | Aug 2–30 (transplant) |
| Brussels sprouts | Jan 6–20 | Mar 3–17 (transplant) | Jul 19–Aug 9 (transplant) |
| Kohlrabi | Feb 3–17 | Mar 3–17 (transplant) Mar 3–17 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Bok choy / Asian greens | – | Mar 3–17 (sow outdoors) | Sep 13–27 (sowing) |
| Arugula | – | Mar 3–31 (sow outdoors) | Sep 13–Oct 11 (sowing) |
| Mustard greens | – | Mar 3–24 (sow outdoors) | Sep 13–27 (sowing) |
| Swiss chard | Feb 17–Mar 3 | Mar 17–Apr 7 (transplant) Mar 17–Apr 14 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Beet | – | Mar 3–31 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Carrot | – | Mar 10–Apr 7 (sow outdoors) | Aug 16–30 (sowing) |
| Radish | – | Feb 24–Apr 7 (sow outdoors) | Sep 27–Oct 11 (sowing) |
| Turnip | – | Mar 3–24 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Parsnip | – | Mar 10–31 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 3–Mar 3 (sow outdoors) | Aug 16–30 (sowing) |
| Onion (bulbing) | Jan 6–20 | Feb 17–Mar 3 (transplant) | – |
| Green onion / scallion | – | Feb 17–Mar 17 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Leek | Jan 6–20 | Mar 3–17 (transplant) | – |
| Garlic | – | – | Sep 27–Oct 25 (sowing) |
| Shallot | – | Feb 17–Mar 3 (transplant) | Sep 27–Oct 25 (sowing) |
| Potato | – | Mar 3–17 (transplant) | Jul 19–Aug 2 (transplant) |
| Sweet potato | – | Apr 21–May 5 (transplant) | – |
| Sweet corn | – | Apr 7–21 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 7–21 (sow outdoors) | Aug 16–30 (sowing) |
| Bean, pole | – | Apr 7–21 (sow outdoors) | – |
| Lima bean | – | Apr 14–28 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 21–May 12 (sow outdoors) | – |
| Cucumber | Mar 3–10 | Apr 7–21 (transplant) Apr 7–21 (sow outdoors) | Aug 16–30 (sowing) |
| Summer squash / zucchini | Mar 3–10 | Apr 7–21 (transplant) Apr 7–21 (sow outdoors) | Aug 16–30 (sowing) |
| Winter squash | Mar 3–10 | Apr 7–21 (transplant) Apr 7–21 (sow outdoors) | – |
| Pumpkin | – | Apr 7–21 (sow outdoors) | – |
| Watermelon | Mar 3–10 | Apr 14–28 (transplant) Apr 14–28 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 3–10 | Apr 14–28 (transplant) Apr 14–28 (sow outdoors) | – |
| Okra | Feb 17–Mar 3 | Apr 14–28 (transplant) Apr 14–28 (sow outdoors) | – |
| Celery | Jan 6–20 | Apr 7–14 (transplant) | – |
| Basil | Feb 17–Mar 3 | Apr 7–21 (transplant) Apr 7–21 (sow outdoors) | – |
| Cilantro | – | Mar 17–Apr 14 (sow outdoors) | Sep 13–27 (sowing) |
| Parsley | Jan 20–Feb 3 | Mar 17–31 (transplant) Mar 10–31 (sow outdoors) | – |
| Dill | – | Mar 31–Apr 14 (sow outdoors) | Sep 13–27 (sowing) |
| Sunflower | – | Mar 31–Apr 14 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 3–17 (transplant) | – |
| Rhubarb (crowns) | – | Mar 3–17 (transplant) | – |
| Strawberry (plants) | – | Mar 3–17 (transplant) | Aug 30–Sep 27 (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: Salt Lake Triad Ctr, UT (NOAA GHCN-Daily ID USC00427606), elevation 4,280 ft, 1.9 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Salt Lake City E Bench, UT | 3 mi | Apr 25 | Oct 18 |
| City Creek WTP, UT | 4 mi | May 13 | Oct 7 |
| Salt Lake City Intl AP, UT | 6 mi | Apr 8 | Oct 31 |
The average last-frost dates of these stations span 44 days, a rough guide to local variation. See data sources & methods.
Frost questions for 84102
When is the last frost in 84102?
The average (50% chance) last spring freeze of 32°F for ZIP 84102 is March 31. For a more cautious planting date, use April 19, when only 1 year in 10 still sees a later freeze.
When is the first frost in 84102?
The average first fall freeze is November 8. In 1 year in 10 it comes by October 23.
What hardiness zone is 84102?
ZIP 84102 is in USDA zone 7b (5 to 10°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 84102 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
84111 Salt Lake City 84112 Salt Lake City 84138 Salt Lake City 84105 Salt Lake City 84113 Salt Lake City 84150 Salt Lake City 84114 Salt Lake City 84101 Salt Lake City
Other ZIP codes in Salt Lake County
84006 84009 84020 84044 84047 84065 84070 84081 84084 84088 84092 84093 84094 84095 84096 84101 84103 84104 84105 84106 84107 84108 84109 84111 All Salt Lake County frost dates · Utah frost dates
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