USDA Hardiness Zone 8b
Frost Dates for 75766 — Jacksonville, Texas
NOAA 1991–2020 normals from Jacksonville, TX (560 ft), 1 miles northwest.
Updated
In Jacksonville, the last spring frost (32°F) is around March 22 in half of years and has passed by April 8 in nine years out of ten. The first fall frost comes around November 14, as early as October 30 one year in ten, leaving a typical freeze-free season of 239 days (NOAA, Jacksonville, TX).
- Last spring frost
- March 22
- First fall frost
- November 14
- Growing season
- 239 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
- 32%
- Snow per year
- 0.2"
median, 1991–2020
median, 1991–2020
8 of 25 observed
NOAA normal
Frost risk by date in Jacksonville
Half of springs at Jacksonville, TX see their last 32°F night by March 22; only one in ten is past it by March 1, and one in ten still has one after April 8. Planting tender crops after March 31 leaves a 30% risk of a frost on them, after April 3 20%, and after April 8 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 86% of the 339 Texas stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 14 in half of years, as early as October 30 one year in ten, and holds off past December 3 one year in ten. A hard freeze of 28°F follows 14 days later, around November 28; in spring the one-in-ten date for 28°F is March 27, 12 days before the 32°F one. The freeze-free season lasts 239 days in a typical year, shorter than at 62% of the 339 Texas stations; it reaches 266 days one year in ten and falls short of 212 one year in ten. On average 37 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 April 4, and return around November 4. Nights of 24°F, cold enough to damage hardier plants, come in 98% of winters and 16°F in 50%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 17 | Mar 24 | Mar 29 | Apr 1 | Apr 4 | Apr 7 | Apr 11 | Apr 15 | Apr 20 |
| 32°F | Mar 1 | Mar 8 | Mar 14 | Mar 18 | Mar 22 | Mar 27 | Mar 31 | Apr 3 | Apr 8 |
| 28°F | Feb 14 | Feb 21 | Feb 28 | Mar 4 | Mar 8 | Mar 12 | Mar 15 | Mar 20 | Mar 27 |
| 24°F98% of yrs | Jan 20 | Jan 30 | Feb 5 | Feb 14 | Feb 21 | Feb 28 | Mar 4 | Mar 9 | Mar 15 |
| 20°F83% of yrs | Dec 31 | Jan 10 | Jan 18 | Jan 25 | Jan 30 | Feb 4 | Feb 13 | Feb 26 | Mar 6 |
| 16°F50% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 21 | Oct 26 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 11 | Nov 15 | Nov 22 |
| 32°F | Oct 30 | Nov 3 | Nov 6 | Nov 10 | Nov 14 | Nov 18 | Nov 23 | Nov 29 | Dec 3 |
| 28°F | Nov 5 | Nov 12 | Nov 17 | Nov 22 | Nov 28 | Dec 1 | Dec 4 | Dec 10 | Dec 18 |
| 24°F98% of yrs | Nov 14 | Nov 23 | Nov 30 | Dec 5 | Dec 11 | Dec 21 | Dec 27 | Jan 3 | Jan 11 |
| 20°F83% of yrs | Nov 30 | Dec 9 | Dec 19 | Dec 27 | Jan 1 | Jan 5 | Jan 11 | Jan 17 | Jan 30 |
| 16°F50% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Jacksonville, 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 75766 →Compare Jacksonville with another place →
Weather by month in Jacksonville
July is the warmest month at Jacksonville, TX, averaging 94°F by day and 72°F at night; January is the coldest at 58°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 85% of years and April still brings one in 28% of years.
Warmth for growing adds up to 6,047 growing degree days a year (base 50°F), fewer than at 69% of the 351 Texas stations. 40% of them (2,400) have built up by the end of June, and July adds the most, 1,015. Precipitation totals 47.5 inches a year, most in October (4.8") and least in August (3.1"); May to September bring 39% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 58 | 34 | 4.5 | 99% | 13 | 63 |
| Feb | 63 | 37 | 4.2 | 99% | 7 | 103 |
| Mar | 70 | 43 | 3.8 | 85% | 3 | 247 |
| Apr | 77 | 51 | 3.4 | 28% | <1 | 426 |
| May | 83 | 61 | 4.3 | 0% | 0 | 688 |
| Jun | 90 | 68 | 4.0 | 0% | 0 | 873 |
| Jul | 94 | 72 | 3.4 | 0% | 0 | 1015 |
| Aug | 94 | 71 | 3.1 | 0% | 0 | 1004 |
| Sep | 89 | 64 | 3.6 | 0% | 0 | 796 |
| Oct | 79 | 54 | 4.8 | 13% | <1 | 510 |
| Nov | 68 | 43 | 4.2 | 80% | 3 | 222 |
| Dec | 61 | 37 | 4.2 | 100% | 10 | 101 |
Monthly normals 1991–2020 at Jacksonville, TX (560 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, Rusk, TX, 12 miles southeast of Jacksonville, has a last frost 15 days earlier (March 7), a first frost 11 days later (November 25), a season 24 days longer.
When it snows in Jacksonville, Texas
Measurable snow is rare here: only 8 of 25 winters from 1991 to 2020 recorded 0.1 inch or more at Jacksonville, TX, 1.3 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 75766
| When | What to do |
|---|---|
| January 11 – January 25 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| January 25 – February 8 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| February 22 – March 8 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 22 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 22 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 31 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 14 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 75766 is 1 mile from Jacksonville, TX, which stands at 560 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 75766 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.