USDA Hardiness Zone 6b
Frost Dates for 84005 — Eagle Mountain, Utah
NOAA 1991–2020 normals from Utah Lake Lehi, UT (4,505 ft), 7 miles east.
Updated
In Eagle Mountain, the last spring frost (32°F) is around April 30 in half of years and has passed by May 27 in nine years out of ten. The first fall frost comes around October 9, as early as September 26 one year in ten, leaving a typical freeze-free season of 159 days (NOAA, Utah Lake Lehi, UT).
- Last spring frost
- April 30
- First fall frost
- October 9
- Growing season
- 159 days
- Hardiness zone
- 6b
50% probability
50% probability
freeze-free, 50%
-5 to 0°F (-20.6 to -17.8°C) coldest night
- First snow
- November 23
- Last snow
- March 21
- Winters with snow
- 100%
- Snow per year
- 26.3"
median, 1991–2020
median, 1991–2020
16 of 16 observed
NOAA normal
Frost risk by date in Eagle Mountain
Half of springs at Utah Lake Lehi, UT see their last 32°F night by April 30; only one in ten is past it by April 14, and one in ten still has one after May 27. Planting tender crops after May 8 leaves a 30% risk of a frost on them, after May 16 20%, and after May 27 10%. The 27 days between the even-odds date and the one-in-ten date is wider than at 98% 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 9 in half of years, as early as September 26 one year in ten, and holds off past October 25 one year in ten. A hard freeze of 28°F follows 13 days later, around October 22; in spring the one-in-ten date for 28°F is May 2, 25 days before the 32°F one. The freeze-free season lasts 159 days in a typical year, longer than at 53% of the 66 Utah stations; it reaches 182 days one year in ten and falls short of 131 one year in ten. On average 149 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 20 days longer, to about May 20, and return around September 28. Severe cold of 16°F or below comes every winter, usually between November 24 and February 17.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 30 | May 5 | May 11 | May 16 | May 20 | May 25 | May 31 | Jun 5 | Jun 13 |
| 32°F | Apr 14 | Apr 20 | Apr 24 | Apr 28 | Apr 30 | May 4 | May 8 | May 16 | May 27 |
| 28°F | Mar 28 | Apr 3 | Apr 7 | Apr 11 | Apr 15 | Apr 19 | Apr 22 | Apr 26 | May 2 |
| 24°F | Mar 4 | Mar 10 | Mar 16 | Mar 23 | Mar 30 | Apr 3 | Apr 7 | Apr 11 | Apr 16 |
| 20°F | Feb 13 | Feb 20 | Feb 25 | Mar 1 | Mar 4 | Mar 8 | Mar 15 | Mar 26 | Apr 5 |
| 16°F | Jan 29 | Feb 3 | Feb 8 | Feb 13 | Feb 17 | Feb 22 | Feb 26 | Mar 2 | Mar 10 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 16 | Sep 20 | Sep 23 | Sep 26 | Sep 28 | Oct 1 | Oct 4 | Oct 7 | Oct 13 |
| 32°F | Sep 26 | Sep 29 | Oct 2 | Oct 6 | Oct 9 | Oct 12 | Oct 16 | Oct 19 | Oct 25 |
| 28°F | Oct 5 | Oct 11 | Oct 15 | Oct 19 | Oct 22 | Oct 25 | Oct 28 | Nov 1 | Nov 6 |
| 24°F | Oct 16 | Oct 23 | Oct 27 | Oct 31 | Nov 2 | Nov 4 | Nov 7 | Nov 11 | Nov 16 |
| 20°F | Oct 28 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 16 | Nov 19 | Nov 23 | Nov 27 |
| 16°F | Nov 6 | Nov 12 | Nov 16 | Nov 20 | Nov 24 | Nov 26 | Nov 29 | Dec 4 | Dec 11 |
Freeze probabilities 1991–2020 at Utah Lake Lehi, 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 84005 →Compare Eagle Mountain with another place →
Weather by month in Eagle Mountain
July is the warmest month at Utah Lake Lehi, UT, averaging 92°F by day and 59°F at night; January is the coldest at 38°F and 19°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 45% of years.
Warmth for growing adds up to 2,887 growing degree days a year (base 50°F), more than at 53% of the 66 Utah stations. 29% of them (847) have built up by the end of June, and July adds the most, 793. Precipitation totals 13.2 inches a year, most in April (1.6") and least in June (0.6"); May to September bring 38% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 38 | 19 | 1.2 | 100% | 29 | 0 |
| Feb | 44 | 24 | 1.1 | 100% | 25 | 1 |
| Mar | 53 | 32 | 1.1 | 100% | 19 | 11 |
| Apr | 62 | 36 | 1.6 | 99% | 9 | 66 |
| May | 71 | 44 | 1.6 | 45% | 1 | 253 |
| Jun | 83 | 51 | 0.6 | 6% | <1 | 515 |
| Jul | 92 | 59 | 0.7 | 0% | 0 | 793 |
| Aug | 89 | 58 | 1.0 | 0% | 0 | 733 |
| Sep | 79 | 47 | 1.1 | 24% | 1 | 394 |
| Oct | 65 | 36 | 1.2 | 97% | 11 | 110 |
| Nov | 49 | 27 | 0.9 | 100% | 24 | 10 |
| Dec | 40 | 20 | 1.1 | 100% | 29 | 0 |
Monthly normals 1991–2020 at Utah Lake Lehi, UT (4,505 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, Draper-Point Of Mountain, UT, 10 miles northeast of Eagle Mountain, has a last frost 12 days earlier (April 18), a first frost 13 days later (October 22), a season 26 days longer.
When it snows in Eagle Mountain, Utah
The first measurable snow (0.1 inch or more) in Eagle Mountain usually arrives around November 23, and the last of the season around March 21. Those are the middle dates across the winters of 1991–2020 at Utah Lake Lehi, UT, 6.5 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 40 days after the last snow.
Planting calendar for 84005
| When | What to do |
|---|---|
| February 19 – March 5 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 5 – March 19 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 2 – April 16 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 30 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 17 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 25 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 9 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 84005 is 7 miles from Utah Lake Lehi, UT, which stands at 4,505 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 84043 (Lehi). The 2023 USDA Plant Hardiness Zone Map lists ZIP 84005 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°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.