Frost dates for ZIP 84104 (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 City Intl AP, UT (2 miles away).
- Average last spring frostApr 850% chance of a 32°F freeze after this date
- Average first fall frostOct 3150% chance of a 32°F freeze by this date
- Growing season (frost-free)204 daysmedian, 32°F threshold
- USDA hardiness zone7b5 to 10°F avg. coldest night
Get The Dial for 84104 (Salt Lake City)
Frost and freeze alerts from the NWS forecast for 84104, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
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.
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
51°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 (23 mi), Grantsville (24 mi), Chicken Ridge (54 mi).
4-inch depth
52°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 (23 mi), Grantsville (24 mi), Chicken Ridge (54 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 84104 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 52°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 Oct 31: 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 17 |
| 50% (the "average" last frost) | Apr 8 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 30 |
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 17 |
| 50% (the "average" first frost) | Oct 31 |
| 90% (late: most years have frozen by now) | Nov 13 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 27 | Oct 19 |
| 32°F (freeze) | Apr 8 | Oct 31 |
| 28°F (hard freeze) | Mar 15 | Nov 10 |
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 84104
Dates count from your average last spring frost (Apr 8) and first fall frost (Oct 31). 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 11–25 | Apr 15–29 (transplant) | – |
| Pepper (sweet and hot) | Jan 28–Feb 11 | Apr 22–May 6 (transplant) | – |
| Eggplant | Jan 28–Feb 11 | Apr 22–May 6 (transplant) | – |
| Tomatillo | Feb 11–25 | Apr 15–29 (transplant) | – |
| Lettuce | Feb 11–25 | Mar 18–Apr 8 (transplant) Mar 11–Apr 22 (sow outdoors) | Sep 5–26 (transplant) Aug 22–Sep 19 (sowing) |
| Spinach | – | Feb 25–Mar 18 (sow outdoors) | Sep 5–26 (sowing) |
| Kale | Feb 11–25 | Mar 11–25 (transplant) Mar 11–25 (sow outdoors) | Aug 8–Sep 5 (transplant) Jul 25–Aug 22 (sowing) |
| Collards | Feb 11–25 | Mar 11–Apr 8 (transplant) Mar 11–Apr 8 (sow outdoors) | Aug 8–Sep 5 (transplant) Jul 25–Aug 22 (sowing) |
| Broccoli | Jan 28–Feb 11 | Mar 11–25 (transplant) | Jul 25–Aug 22 (transplant) |
| Cabbage | Jan 28–Feb 11 | Mar 11–25 (transplant) | Jul 25–Aug 22 (transplant) |
| Cauliflower | Jan 28–Feb 11 | Mar 25–Apr 8 (transplant) | Jul 25–Aug 22 (transplant) |
| Brussels sprouts | Jan 14–28 | Mar 11–25 (transplant) | Jul 11–Aug 1 (transplant) |
| Kohlrabi | Feb 11–25 | Mar 11–25 (transplant) Mar 11–25 (sow outdoors) | Aug 22–Sep 5 (sowing) |
| Bok choy / Asian greens | – | Mar 11–25 (sow outdoors) | Sep 5–19 (sowing) |
| Arugula | – | Mar 11–Apr 8 (sow outdoors) | Sep 5–Oct 3 (sowing) |
| Mustard greens | – | Mar 11–Apr 1 (sow outdoors) | Sep 5–19 (sowing) |
| Swiss chard | Feb 25–Mar 11 | Mar 25–Apr 15 (transplant) Mar 25–Apr 22 (sow outdoors) | Aug 22–Sep 5 (sowing) |
| Beet | – | Mar 11–Apr 8 (sow outdoors) | Aug 22–Sep 5 (sowing) |
| Carrot | – | Mar 18–Apr 15 (sow outdoors) | Aug 8–22 (sowing) |
| Radish | – | Mar 4–Apr 15 (sow outdoors) | Sep 19–Oct 3 (sowing) |
| Turnip | – | Mar 11–Apr 1 (sow outdoors) | Aug 22–Sep 5 (sowing) |
| Parsnip | – | Mar 18–Apr 8 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 11–Mar 11 (sow outdoors) | Aug 8–22 (sowing) |
| Onion (bulbing) | Jan 14–28 | Feb 25–Mar 11 (transplant) | – |
| Green onion / scallion | – | Feb 25–Mar 25 (sow outdoors) | Aug 22–Sep 5 (sowing) |
| Leek | Jan 14–28 | Mar 11–25 (transplant) | – |
| Garlic | – | – | Sep 19–Oct 17 (sowing) |
| Shallot | – | Feb 25–Mar 11 (transplant) | Sep 19–Oct 17 (sowing) |
| Potato | – | Mar 11–25 (transplant) | Jul 11–25 (transplant) |
| Sweet potato | – | Apr 29–May 13 (transplant) | – |
| Sweet corn | – | Apr 15–29 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 15–29 (sow outdoors) | – |
| Bean, pole | – | Apr 15–29 (sow outdoors) | – |
| Lima bean | – | Apr 22–May 6 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 29–May 20 (sow outdoors) | – |
| Cucumber | Mar 11–18 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | – |
| Summer squash / zucchini | Mar 11–18 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | – |
| Winter squash | Mar 11–18 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | – |
| Pumpkin | – | Apr 15–29 (sow outdoors) | – |
| Watermelon | Mar 11–18 | Apr 22–May 6 (transplant) Apr 22–May 6 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 11–18 | Apr 22–May 6 (transplant) Apr 22–May 6 (sow outdoors) | – |
| Okra | Feb 25–Mar 11 | Apr 22–May 6 (transplant) Apr 22–May 6 (sow outdoors) | – |
| Celery | Jan 14–28 | Apr 15–22 (transplant) | – |
| Basil | Feb 25–Mar 11 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | – |
| Cilantro | – | Mar 25–Apr 22 (sow outdoors) | Sep 5–19 (sowing) |
| Parsley | Jan 28–Feb 11 | Mar 25–Apr 8 (transplant) Mar 18–Apr 8 (sow outdoors) | – |
| Dill | – | Apr 8–22 (sow outdoors) | Sep 5–19 (sowing) |
| Sunflower | – | Apr 8–22 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 11–25 (transplant) | – |
| Rhubarb (crowns) | – | Mar 11–25 (transplant) | – |
| Strawberry (plants) | – | Mar 11–25 (transplant) | Aug 22–Sep 19 (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 City Intl AP, UT (NOAA GHCN-Daily ID USW00024127), elevation 4,225 ft, 2.1 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Salt Lake Triad Ctr, UT | 5 mi | Mar 31 | Nov 8 |
| Salt Lake City E Bench, UT | 9 mi | Apr 25 | Oct 18 |
| Bountiful-val Verda, UT | 9 mi | Apr 24 | Oct 19 |
The average last-frost dates of these stations span 25 days, a rough guide to local variation. See data sources & methods.
Frost questions for 84104
When is the last frost in 84104?
The average (50% chance) last spring freeze of 32°F for ZIP 84104 is April 8. For a more cautious planting date, use April 30, when only 1 year in 10 still sees a later freeze.
When is the first frost in 84104?
The average first fall freeze is October 31. In 1 year in 10 it comes by October 17.
What hardiness zone is 84104?
ZIP 84104 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 84104 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
84120 West Valley City 84119 West Valley City 84101 Salt Lake City 84128 West Valley City 84180 Salt Lake City 84150 Salt Lake City 84138 Salt Lake City 84111 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 84102 84103 84105 84106 84107 84108 84109 84111 All Salt Lake County frost dates · Utah frost dates
Never miss a frost: get The Dial
Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
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.