USDA Hardiness Zone 8b
Frost Dates for 75651 — Harleton, Texas
NOAA 1991–2020 normals from Jefferson, TX (211 ft), 12 miles northeast.
Updated
In Harleton, the last spring frost (32°F) is around March 18 in half of years and has passed by April 7 in nine years out of ten. The first fall frost comes around November 8, as early as October 26 one year in ten, leaving a typical freeze-free season of 236 days (NOAA, Jefferson, TX).
- Last spring frost
- March 18
- First fall frost
- November 8
- Growing season
- 236 days
- Hardiness zone
- 8b
50% probability
50% probability
freeze-free, 50%
15 to 20°F (-9.4 to -6.7°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 44%
- Snow per year
- 1.3"
median, 1991–2020
median, 1991–2020
7 of 16 observed
NOAA normal
Frost risk by date in Harleton
Half of springs at Jefferson, TX see their last 32°F night by March 18; only one in ten is past it by February 28, and one in ten still has one after April 7. Planting tender crops after March 27 leaves a 30% risk of a frost on them, after April 1 20%, and after April 7 10%. The 20 days between the even-odds date and the one-in-ten date is narrower than at 51% of the 339 Texas stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 8 in half of years, as early as October 26 one year in ten, and holds off past November 30 one year in ten. A hard freeze of 28°F follows 14 days later, around November 22; in spring the one-in-ten date for 28°F is March 22, 16 days before the 32°F one. The freeze-free season lasts 236 days in a typical year, shorter than at 67% of the 339 Texas stations; it reaches 263 days one year in ten and falls short of 210 one year in ten. On average 55 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 April 2, and return around October 30. Nights of 24°F, cold enough to damage hardier plants, come in 99% of winters and 16°F in 43%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 13 | Mar 20 | Mar 25 | Mar 29 | Apr 2 | Apr 5 | Apr 9 | Apr 14 | Apr 21 |
| 32°F | Feb 28 | Mar 5 | Mar 9 | Mar 14 | Mar 18 | Mar 23 | Mar 27 | Apr 1 | Apr 7 |
| 28°F | Feb 7 | Feb 18 | Feb 24 | Feb 28 | Mar 3 | Mar 6 | Mar 11 | Mar 15 | Mar 22 |
| 24°F99% of yrs | Jan 14 | Jan 25 | Jan 31 | Feb 7 | Feb 14 | Feb 19 | Feb 26 | Mar 2 | Mar 9 |
| 20°F82% of yrs | Dec 26 | Jan 5 | Jan 13 | Jan 20 | Jan 26 | Jan 31 | Feb 5 | Feb 14 | Feb 27 |
| 16°F43% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 18 | Oct 22 | Oct 25 | Oct 28 | Oct 30 | Nov 1 | Nov 4 | Nov 8 | Nov 15 |
| 32°F | Oct 26 | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 12 | Nov 17 | Nov 22 | Nov 30 |
| 28°F | Nov 1 | Nov 7 | Nov 12 | Nov 17 | Nov 22 | Nov 28 | Dec 1 | Dec 5 | Dec 12 |
| 24°F99% of yrs | Nov 13 | Nov 21 | Nov 28 | Dec 1 | Dec 6 | Dec 12 | Dec 19 | Dec 27 | Jan 5 |
| 20°F82% of yrs | Nov 29 | Dec 5 | Dec 13 | Dec 21 | Dec 26 | Jan 1 | Jan 6 | Jan 14 | Jan 30 |
| 16°F43% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Jefferson, TX, 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 75651 →Compare Harleton with another place →
Weather by month in Harleton
July is the warmest month at Jefferson, TX, averaging 94°F by day and 72°F at night; January is the coldest at 57°F and 34°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 84% of years and April still brings one in 21% of years.
Warmth for growing adds up to 6,002 growing degree days a year (base 50°F), fewer than at 72% of the 351 Texas stations. 40% of them (2,426) have built up by the end of June, and July adds the most, 1,026. Precipitation totals 49.7 inches a year, most in May (5.1") and least in August (2.4"); May to September bring 39% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 57 | 34 | 4.1 | 100% | 17 | 64 |
| Feb | 61 | 37 | 4.2 | 98% | 10 | 96 |
| Mar | 69 | 44 | 4.8 | 84% | 5 | 251 |
| Apr | 77 | 52 | 4.7 | 21% | 1 | 426 |
| May | 83 | 61 | 5.1 | 0% | 0 | 691 |
| Jun | 91 | 69 | 5.1 | 0% | 0 | 898 |
| Jul | 94 | 72 | 3.0 | 0% | 0 | 1026 |
| Aug | 95 | 71 | 2.4 | 0% | 0 | 1012 |
| Sep | 89 | 64 | 3.8 | 0% | 0 | 784 |
| Oct | 79 | 52 | 4.5 | 21% | 1 | 473 |
| Nov | 67 | 42 | 3.6 | 88% | 8 | 198 |
| Dec | 59 | 35 | 4.4 | 100% | 15 | 82 |
Monthly normals 1991–2020 at Jefferson, TX (211 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, Diana 2 W, TX, 14 miles west of Harleton, has a last frost 8 days earlier (March 10), a first frost 7 days later (November 15), a season 15 days longer.
When it snows in Harleton, Texas
Measurable snow is rare here: only 7 of 16 winters from 1991 to 2020 recorded 0.1 inch or more at Jefferson, TX, 12 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 75651
| When | What to do |
|---|---|
| January 7 – January 21 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| January 21 – February 4 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| February 18 – March 4 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 18 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 16 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 25 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 8 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 75651 is 12 miles from Jefferson, TX, which stands at 211 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 75657 (Jefferson). The 2023 USDA Plant Hardiness Zone Map lists ZIP 75651 in zone 8b, the band where the coldest night of the year averaged 15 to 20°F (-9.4 to -6.7°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.