USDA Hardiness Zone 7b
Frost Dates for 84106 — Salt Lake City, Utah
NOAA 1991–2020 normals from Salt Lake City E Bench, UT (4,850 ft), 3 miles northeast.
Updated
In Salt Lake City, the last spring frost (32°F) is around April 25 in half of years and has passed by May 10 in nine years out of ten. The first fall frost comes around October 18, as early as October 5 one year in ten, leaving a typical freeze-free season of 175 days (NOAA, Salt Lake City E Bench, UT).
- Last spring frost
- April 25
- First fall frost
- October 18
- Growing season
- 175 days
- Hardiness zone
- 7b
50% probability
50% probability
freeze-free, 50%
5 to 10°F (-15.0 to -12.2°C) coldest night
- First snow
- November 4
- Last snow
- April 16
- Winters with snow
- 100%
- Snow per year
- 49"
median, 1991–2020
median, 1991–2020
22 of 22 observed
NOAA normal
Frost risk by date in Salt Lake City
Half of springs at Salt Lake City E Bench, UT see their last 32°F night by April 25; only one in ten is past it by April 7, and one in ten still has one after May 10. Planting tender crops after May 1 leaves a 30% risk of a frost on them, after May 5 20%, and after May 10 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 89% of the 66 Utah stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 18 in half of years, as early as October 5 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 11 days later, around October 29; in spring the one-in-ten date for 28°F is April 26, 14 days before the 32°F one. The freeze-free season lasts 175 days in a typical year, longer than at 71% of the 66 Utah stations; it reaches 198 days one year in ten and falls short of 156 one year in ten. On average 119 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 13 days longer, to about May 8, and return around October 8. Severe cold of 16°F or below comes every winter, usually between December 1 and February 19.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 24 | Apr 29 | May 2 | May 5 | May 8 | May 11 | May 15 | May 19 | May 29 |
| 32°F | Apr 7 | Apr 14 | Apr 18 | Apr 21 | Apr 25 | Apr 29 | May 1 | May 5 | May 10 |
| 28°F | Mar 19 | Mar 26 | Mar 30 | Apr 3 | Apr 7 | Apr 11 | Apr 15 | Apr 20 | Apr 26 |
| 24°F | Mar 3 | Mar 9 | Mar 13 | Mar 17 | Mar 22 | Mar 27 | Mar 31 | Apr 4 | Apr 11 |
| 20°F | Feb 13 | Feb 21 | Feb 25 | Mar 1 | Mar 4 | Mar 8 | Mar 12 | Mar 19 | Mar 27 |
| 16°F | Jan 27 | Feb 4 | Feb 10 | Feb 15 | Feb 19 | Feb 23 | Feb 27 | Mar 3 | Mar 10 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 28 | Oct 1 | Oct 4 | Oct 6 | Oct 8 | Oct 11 | Oct 14 | Oct 17 | Oct 21 |
| 32°F | Oct 5 | Oct 8 | Oct 12 | Oct 15 | Oct 18 | Oct 21 | Oct 23 | Oct 27 | Nov 1 |
| 28°F | Oct 15 | Oct 19 | Oct 22 | Oct 26 | Oct 29 | Nov 1 | Nov 6 | Nov 9 | Nov 15 |
| 24°F | Oct 22 | Oct 29 | Nov 1 | Nov 6 | Nov 9 | Nov 12 | Nov 17 | Nov 22 | Nov 28 |
| 20°F | Nov 1 | Nov 8 | Nov 12 | Nov 16 | Nov 21 | Nov 24 | Nov 28 | Dec 2 | Dec 8 |
| 16°F | Nov 12 | Nov 18 | Nov 24 | Nov 28 | Dec 1 | Dec 4 | Dec 8 | Dec 13 | Dec 19 |
Freeze probabilities 1991–2020 at Salt Lake City E Bench, UT, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 84106 →Compare Salt Lake City with another place →
Weather by month in Salt Lake City
July is the warmest month at Salt Lake City E Bench, UT, averaging 92°F by day and 63°F at night; January is the coldest at 40°F and 23°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 32% of years.
Warmth for growing adds up to 3,378 growing degree days a year (base 50°F), more than at 77% of the 66 Utah stations. 31% of them (1,046) have built up by the end of June, and July adds the most, 863.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 40 | 23 | 100% | 26 | 0 |
| Feb | 46 | 26 | 100% | 22 | 2 |
| Mar | 56 | 33 | 100% | 15 | 34 |
| Apr | 63 | 38 | 94% | 7 | 113 |
| May | 73 | 46 | 32% | 1 | 316 |
| Jun | 84 | 55 | 0% | 0 | 582 |
| Jul | 92 | 63 | 0% | 0 | 863 |
| Aug | 90 | 62 | 0% | 0 | 800 |
| Sep | 80 | 53 | 2% | <1 | 488 |
| Oct | 66 | 41 | 89% | 4 | 157 |
| Nov | 52 | 31 | 100% | 18 | 24 |
| Dec | 41 | 23 | 100% | 26 | 1 |
Monthly normals 1991–2020 at Salt Lake City E Bench, UT (4,850 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Salt Lake Triad Ctr, UT, 5 miles northwest of Salt Lake City and 570 feet lower, has a last frost 25 days earlier (March 31), a first frost 21 days later (November 8), a season 49 days longer.
When it snows in Salt Lake City, Utah
The first measurable snow (0.1 inch or more) in Salt Lake City usually arrives around November 4, and the last of the season around April 16. Those are the middle dates across the winters of 1991–2020 at Salt Lake Triad Ctr, UT, 4.9 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 9 days after the last snow.
Planting calendar for 84106
| When | What to do |
|---|---|
| February 14 – February 28 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 28 – March 14 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 28 – April 11 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 25 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 26 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 4 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 18 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 84106 is 3 miles from Salt Lake City E Bench, UT, which stands at 4,850 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station; its figures are presented in full for 84123 (Taylorsville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 84106 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.