USDA Hardiness Zone 6a
Frost Dates for 84318 — Hyde Park, Utah
NOAA 1991–2020 normals from Logan Cache Airport, UT (4,454 ft), 2 miles southwest.
Updated
In Hyde Park, the last spring frost (32°F) is around May 8 in half of years and has passed by May 29 in nine years out of ten. The first fall frost comes around October 2, as early as September 19 one year in ten, leaving a typical freeze-free season of 144 days (NOAA, Logan Cache Airport, UT).
- Last spring frost
- May 8
- First fall frost
- October 2
- Growing season
- 144 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
- November 5
- Last snow
- April 16
- Winters with snow
- 100%
- Snow per year
- 61.5"
median, 1991–2020
median, 1991–2020
29 of 29 observed
NOAA normal
Frost risk by date in Hyde Park
Half of springs at Logan Cache Airport, UT see their last 32°F night by May 8; only one in ten is past it by April 24, and one in ten still has one after May 29. Planting tender crops after May 15 leaves a 30% risk of a frost on them, after May 20 20%, and after May 29 10%. The 21 days between the even-odds date and the one-in-ten date is wider than at 74% of the 66 Utah stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.
In fall the first 32°F night comes by October 2 in half of years, as early as September 19 one year in ten, and holds off past October 15 one year in ten. A hard freeze of 28°F follows 11 days later, around October 13; in spring the one-in-ten date for 28°F is May 6, 23 days before the 32°F one. The freeze-free season lasts 144 days in a typical year, shorter than at 59% of the 66 Utah stations; it reaches 165 days one year in ten and falls short of 121 one year in ten. On average 173 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 22 days longer, to about May 30, and return around September 20. Severe cold of 16°F or below comes every winter, usually between November 17 and March 5.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 10 | May 15 | May 19 | May 24 | May 30 | Jun 3 | Jun 6 | Jun 11 | Jun 17 |
| 32°F | Apr 24 | Apr 30 | May 2 | May 5 | May 8 | May 11 | May 15 | May 20 | May 29 |
| 28°F | Apr 4 | Apr 10 | Apr 14 | Apr 18 | Apr 22 | Apr 25 | Apr 28 | May 2 | May 6 |
| 24°F | Mar 12 | Mar 17 | Mar 22 | Mar 28 | Apr 1 | Apr 4 | Apr 9 | Apr 14 | Apr 20 |
| 20°F | Feb 28 | Mar 4 | Mar 7 | Mar 10 | Mar 13 | Mar 15 | Mar 19 | Mar 25 | Mar 31 |
| 16°F | Feb 19 | Feb 25 | Feb 28 | Mar 3 | Mar 5 | Mar 7 | Mar 10 | Mar 13 | Mar 18 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 5 | Sep 10 | Sep 14 | Sep 17 | Sep 20 | Sep 23 | Sep 26 | Sep 30 | Oct 4 |
| 32°F | Sep 19 | Sep 23 | Sep 27 | Sep 30 | Oct 2 | Oct 5 | Oct 7 | Oct 10 | Oct 15 |
| 28°F | Sep 29 | Oct 3 | Oct 6 | Oct 10 | Oct 13 | Oct 16 | Oct 18 | Oct 22 | Oct 27 |
| 24°F | Oct 11 | Oct 16 | Oct 19 | Oct 23 | Oct 25 | Oct 28 | Nov 1 | Nov 4 | Nov 10 |
| 20°F | Oct 20 | Oct 26 | Oct 29 | Nov 1 | Nov 5 | Nov 8 | Nov 12 | Nov 17 | Nov 23 |
| 16°F | Oct 30 | Nov 5 | Nov 9 | Nov 13 | Nov 17 | Nov 22 | Nov 25 | Nov 29 | Dec 5 |
Freeze probabilities 1991–2020 at Logan Cache Airport, 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 84318 →Compare Hyde Park with another place →
Weather by month in Hyde Park
July is the warmest month at Logan Cache Airport, UT, averaging 91°F by day and 55°F at night; January is the coldest at 32°F and 15°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 75% of years.
Warmth for growing adds up to 2,436 growing degree days a year (base 50°F), fewer than at 68% of the 66 Utah stations. 27% of them (666) have built up by the end of June, and July adds the most, 714. Precipitation totals 15.7 inches a year, most in May (2.1") and least in July (0.3"); May to September bring 35% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 32 | 15 | 1.4 | 100% | 30 | 0 |
| Feb | 37 | 18 | 1.3 | 100% | 26 | 0 |
| Mar | 50 | 29 | 1.7 | 100% | 23 | 8 |
| Apr | 60 | 35 | 2.0 | 100% | 14 | 42 |
| May | 69 | 42 | 2.1 | 75% | 4 | 196 |
| Jun | 81 | 47 | 1.2 | 8% | <1 | 420 |
| Jul | 91 | 55 | 0.3 | 0% | 0 | 714 |
| Aug | 89 | 53 | 0.7 | 0% | 0 | 651 |
| Sep | 78 | 44 | 1.2 | 43% | 2 | 338 |
| Oct | 63 | 34 | 1.5 | 99% | 17 | 65 |
| Nov | 47 | 25 | 1.2 | 100% | 27 | 3 |
| Dec | 33 | 17 | 1.1 | 100% | 30 | 0 |
Monthly normals 1991–2020 at Logan Cache Airport, UT (4,454 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, Logan Utah St Univ, UT, 4 miles south of Hyde Park and 336 feet higher, has a last frost 8 days earlier (April 30), a first frost 14 days later (October 16), a season 22 days longer.
When it snows in Hyde Park, Utah
The first measurable snow (0.1 inch or more) in Hyde Park usually arrives around November 5, and the last of the season around April 16. Those are the middle dates across the winters of 1991–2020 at Logan Utah St Univ, UT, 3.9 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 22 days after the last snow.
Planting calendar for 84318
| When | What to do |
|---|---|
| February 27 – March 13 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 13 – March 27 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 10 – April 24 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| May 8 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 10 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 18 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 2 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 84318 is 2 miles from Logan Cache Airport, UT, which stands at 4,454 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 84341 (Logan). The 2023 USDA Plant Hardiness Zone Map lists ZIP 84318 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.