US Grow Zones

South Jordan, Utah: planting zone & frost dates

Last updated · Sources: PRISM/OSU 2023 ZIP zone listings; NOAA NCEI 1991–2020 Climate Normals (station USC00422235); U.S. Census Bureau — see methodology

South Jordan is in USDA plant hardiness zone 7a, where the average coldest winter night reaches 0 to 5°F (-17.8 to -15.0°C). The typical last spring frost is around Apr 25 and the first fall frost around Oct 16.

Hardiness zone7A0 to 5°F
Last spring frostApr 2530% chance of frost after
First fall frostOct 1630% chance of frost before
Growing season185 daysmedian frost-free days

Frost dates

ProbabilityLast spring frost (32°F)First fall frost (32°F)
Safer (10% risk)May 6Oct 7
Typical planning date (30% risk)Apr 25Oct 16
Median (50%)Apr 18Oct 22

How to read this: after the spring "10% risk" date, a 32°F frost happens in only about 1 year in 10. In fall, the "10% risk" date is the early end — a frost before it happens about 1 year in 10.

Frost data comes from NOAA station DRAPER-POINT OF MTN, UT (USC00422235), 6.7 mi (10.8 km) from the city center and 295 ft lower than the city center (-90 m). Record used for the 1991–2020 normals: 15 years.

Frost probability in spring and fall, South Jordan, UTChance of a 32°F frost in South Jordan, UT, NOAA 1991–2020. Spring: the chance of another frost falls from 90% on Mar 31 to 10% on May 6. Fall: the chance that the first frost has arrived rises from 10% on Oct 7 to 90% on Nov 5.0%50%100%Spring: later frostMar 1Apr 1May 130%: Apr 25Fall: frost arrivedOct 1Oct 15Nov 1Nov 1530%: Oct 1632°F frost28°F hard freezeplanning date
Shaded areas show the chance of a 32°F frost: falling through spring, rising through fall. The dashed line is the 28°F hard-freeze curve. Data: NOAA 1991–2020 Normals, station USC00422235.
Frost-free growing season in South Jordan, UT1 in 10 risk: May 6 to Oct 7 (154 days); 3 in 10 risk: Apr 25 to Oct 16 (174 days); Median (50%): Apr 18 to Oct 22 (187 days); No 28°F freeze: Mar 31 to Nov 2 (216 days). In 9 of 10 years the 32°F-free season is at least 162 days.Frost-free days, spring to fallJFMAMJJASOND1 in 10 risk154 days3 in 10 risk174 daysMedian (50%)187 daysNo 28°F freeze216 days
Frost-free window at three risk levels, plus the window between 28°F hard freezes. Read about what the probabilities mean.

Why your yard may differ from the station: microclimates.

Hardiness zone across South Jordan

All 2 ZIP codes covering South Jordan are in zone 7a.

ZIP codes in South Jordan and their zones
ZIPZoneShare of city land
840957a51.9%
840097a48.1%

Vegetable planting calendar for South Jordan

Dates are counted from the 30%-risk frost dates above (last frost Apr 25, first frost Oct 16). Shift a week later in cold spots or low-lying ground.

CropStart indoorsTransplant / plant outDirect sowFall crop sow/plant
TomatoFeb 28 – Mar 14May 2 – May 16——
PepperFeb 14 – Feb 28May 9 – May 23——
LettuceMar 14 – Mar 28Apr 11 – May 2Mar 28 – May 9Aug 7 – Sep 4
Green Beans——May 2 – Jun 6Jul 24 – Aug 7
Sweet Corn——May 2 – May 30—
Zucchini & Summer SquashMar 28 – Apr 4May 2 – May 16May 2 – May 23Jul 24 – Aug 7
CucumberMar 28 – Apr 4May 9 – May 16May 2 – May 23Jul 24 – Aug 7
Carrot——Apr 4 – May 9Jul 24 – Aug 7
OnionJan 31 – Feb 14Mar 28 – Apr 11——
Potato—Mar 28 – Apr 18——
BasilMar 14 – Mar 28May 9 – May 23May 9 – May 30—
Spinach——Mar 14 – Apr 11Aug 21 – Sep 18
KaleFeb 28 – Mar 14Mar 28 – Apr 18Mar 28 – Apr 18Aug 7 – Sep 4
BroccoliFeb 28 – Mar 14Apr 11 – May 2—Jul 24 – Aug 7
Peas——Mar 14 – Apr 4Aug 7 – Aug 21
EggplantFeb 14 – Feb 28May 9 – May 23——
CabbageFeb 28 – Mar 14Mar 28 – Apr 11—Jul 24 – Aug 7
Radish——Mar 21 – May 9Sep 4 – Oct 2
Strawberry—Mar 28 – Apr 18——
Beets——Apr 4 – May 16Aug 7 – Aug 21

Nearby cities in Utah

More: all Utah cities · other zone 7a cities: Louisville, KY, Wichita, KS, Cleveland, OH, Lexington, KY, St. Louis, MO, Boise, ID, Amarillo, TX, Providence, RI

South Jordan gardening questions

When is the last frost in South Jordan, UT?

Plan around Apr 25. At NOAA's Draper-point Of Mtn, UT station, 6.7 mi from the city center, there is a 30% chance of a 32°F frost after that date. Half of springs have their last frost by Apr 18, and after May 6 the risk drops to about 1 in 10. A hard freeze (28°F) usually ends earlier, around Mar 31. The 90% and 10% dates are 36 days apart, close to the 36-day median for cities on this site.

When should I plant tomatoes in South Jordan, UT?

Start seeds indoors Feb 28 – Mar 14 and set transplants outside May 2 – May 16, once nights stay above 50°F and the soil is near 60°F. That leaves 174 days between the 30% frost dates, enough for most varieties including 80–85-day slicers. More: tomato planting dates by zone.

How long is the growing season in South Jordan?

About 185 days without a 32°F frost in a typical (median) year. In 9 years out of 10 the season lasts at least 162 days, and in 1 year in 10 it runs 209 days or more. In fall there is a 10% chance of frost by Oct 7 and a 30% chance by Oct 16. That ranks 6th longest of 11 Utah cities on this site.

When should I plant a fall garden in South Jordan?

Count back from the first fall frost (Oct 16): transplant broccoli Jul 24 – Aug 7; sow kale Aug 7 – Sep 4; sow lettuce Aug 7 – Sep 4; sow radishes Sep 4 – Oct 2. Hardy crops keep growing through light frosts; the median 28°F hard freeze here is Nov 2. How the math works: succession and fall planting.

Did South Jordan's hardiness zone change on the 2023 map?

No. Going by the zone that covers most of the city's land, South Jordan is zone 7a on both the 2012 and the 2023 USDA maps (PRISM/OSU ZIP listings). About 42% of U.S. ZIP codes kept their half-zone in 2023. Why the 2023 map is warmer.

How does South Jordan compare with Sandy, UT?

South Jordan is zone 7a and Sandy is zone 7b. The typical last spring frost in South Jordan (Apr 25) comes about 13 days earlier than in Sandy, UT (May 8), 8 miles away, and the first fall frost is Oct 16 versus Oct 16. The two cities use different NOAA stations.