USDA Hardiness Zone 6a
Frost Dates for 84032 — Heber City, Utah
NOAA 1991–2020 normals from Heber, UT (5,590 ft), 5 miles west.
Updated
In Heber City, the last spring frost (32°F) is around June 4 in half of years and has passed by June 21 in nine years out of ten. The first fall frost comes around September 20, as early as September 6 one year in ten, leaving a typical freeze-free season of 106 days (NOAA, Heber, UT).
- Last spring frost
- June 4
- First fall frost
- September 20
- Growing season
- 106 days
- Hardiness zone
- 6a
50% probability
50% probability
freeze-free, 50%
-10 to -5°F (-23.3 to -20.6°C) coldest night
- First snow
- October 31
- Last snow
- April 19
- Winters with snow
- 100%
- Snow per year
- 75"
median, 1991–2020
median, 1991–2020
23 of 23 observed
NOAA normal
Frost risk by date in Heber City
Half of springs at Heber, UT see their last 32°F night by June 4; only one in ten is past it by May 18, and one in ten still has one after June 21. Planting tender crops after June 11 leaves a 30% risk of a frost on them, after June 15 20%, and after June 21 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 68% of the 66 Utah stations behind this site's ZIP pages.
In fall the first 32°F night comes by September 20 in half of years, as early as September 6 one year in ten, and holds off past October 1 one year in ten. A hard freeze of 28°F follows 11 days later, around October 1; in spring the one-in-ten date for 28°F is June 8, 13 days before the 32°F one. The freeze-free season lasts 106 days in a typical year, shorter than at 86% of the 66 Utah stations; it reaches 128 days one year in ten and falls short of 85 one year in ten. On average 181 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 15 days longer, to about June 19, and return around September 9. Severe cold of 16°F or below comes every winter, usually between November 6 and March 22.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 5 | Jun 9 | Jun 13 | Jun 16 | Jun 19 | Jun 23 | Jun 25 | Jun 28 | Jul 2 |
| 32°F | May 18 | May 23 | May 28 | May 31 | Jun 4 | Jun 7 | Jun 11 | Jun 15 | Jun 21 |
| 28°F | May 1 | May 5 | May 9 | May 13 | May 17 | May 21 | May 28 | Jun 1 | Jun 8 |
| 24°F | Apr 12 | Apr 17 | Apr 21 | Apr 26 | Apr 29 | May 2 | May 7 | May 11 | May 17 |
| 20°F | Mar 23 | Mar 31 | Apr 3 | Apr 6 | Apr 11 | Apr 14 | Apr 18 | Apr 22 | Apr 29 |
| 16°F | Mar 4 | Mar 9 | Mar 13 | Mar 17 | Mar 22 | Mar 27 | Mar 31 | Apr 5 | Apr 10 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Aug 28 | Sep 1 | Sep 4 | Sep 7 | Sep 9 | Sep 12 | Sep 14 | Sep 18 | Sep 21 |
| 32°F | Sep 6 | Sep 11 | Sep 14 | Sep 17 | Sep 20 | Sep 22 | Sep 24 | Sep 27 | Oct 1 |
| 28°F | Sep 17 | Sep 22 | Sep 25 | Sep 28 | Oct 1 | Oct 3 | Oct 5 | Oct 9 | Oct 15 |
| 24°F | Sep 29 | Oct 3 | Oct 6 | Oct 10 | Oct 13 | Oct 17 | Oct 21 | Oct 25 | Oct 31 |
| 20°F | Oct 10 | Oct 16 | Oct 21 | Oct 24 | Oct 27 | Oct 31 | Nov 2 | Nov 6 | Nov 11 |
| 16°F | Oct 23 | Oct 28 | Nov 1 | Nov 3 | Nov 6 | Nov 10 | Nov 14 | Nov 17 | Nov 22 |
Freeze probabilities 1991–2020 at Heber, 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 84032 →Compare Heber City with another place →
Weather by month in Heber City
July is the warmest month at Heber, UT, averaging 90°F by day and 50°F at night; January is the coldest at 37°F and 13°F. A freezing night is all but certain in every month from October to May (a 90% chance or more). From July to August the chance of a 32°F night stays under 10% each month. In spring, June still brings one in 58% of years.
Warmth for growing adds up to 2,061 growing degree days a year (base 50°F), fewer than at 82% of the 66 Utah stations. 27% of them (549) have built up by the end of June, and July adds the most, 606. Precipitation totals 15.0 inches a year, most in January (1.9") and least in July (0.5"); May to September bring 32% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 37 | 13 | 1.9 | 100% | 30 | 0 |
| Feb | 41 | 16 | 1.7 | 100% | 27 | 0 |
| Mar | 53 | 24 | 1.2 | 100% | 27 | 3 |
| Apr | 61 | 30 | 1.4 | 100% | 18 | 33 |
| May | 71 | 36 | 1.4 | 100% | 6 | 155 |
| Jun | 82 | 42 | 0.9 | 58% | 1 | 358 |
| Jul | 90 | 50 | 0.5 | 0% | 0 | 606 |
| Aug | 88 | 49 | 0.8 | 4% | <1 | 558 |
| Sep | 79 | 40 | 1.2 | 88% | 3 | 287 |
| Oct | 66 | 31 | 1.3 | 100% | 16 | 58 |
| Nov | 50 | 22 | 1.1 | 100% | 25 | 3 |
| Dec | 37 | 14 | 1.6 | 100% | 30 | 0 |
Monthly normals 1991–2020 at Heber, UT (5,590 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, Snake Creek Powerhouse, UT, 9 miles west of Heber City and 420 feet higher, has a last frost 4 days earlier (May 31), a first frost 9 days earlier (September 11), a season 5 days shorter.
When it snows in Heber City, Utah
The first measurable snow (0.1 inch or more) in Heber City usually arrives around October 31, and the last of the season around April 19. Those are the middle dates across the winters of 1991–2020 at Heber, UT, 5.1 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 46 days after the last snow.
Planting calendar for 84032
| When | What to do |
|---|---|
| March 26 – April 9 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| April 9 – April 23 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| May 7 – May 21 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| June 4 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by June 28 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 6 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| September 20 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 84032 is 5 miles from Heber, UT, which stands at 5,590 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 84032 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°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.