USDA Hardiness Zone 9b
Frost Dates for 78372 — Orange Grove, Texas
NOAA 1991–2020 normals from Mathis 4 SSW, TX (138 ft), 13 miles northeast.
Updated
A freeze (32°F) reaches Orange Grove in 89% of winters. When it does, the first fall frost comes around December 23 and the last spring frost around January 31; after March 4 the chance of another is under 9%.
- Last spring frost
- January 31
- First fall frost
- December 23
- Winters with a freeze
- 89%
- Hardiness zone
- 9b
50%, in freezing years
50%, in freezing years
32°F or below, 1991–2020
25 to 30°F (-3.9 to -1.1°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 24 observed
NOAA normal
Frost risk by date in Orange Grove
In the 89% of winters that bring a 32°F night, half of springs at Mathis 4 SSW, TX see their last 32°F night by January 31; only one in ten is past it by December 22, and one in ten still has one after March 4. Counting the winters with no freeze at all, the risk of a 32°F night after March 4 is under 9% and after January 31 44%. The 32 days between the even-odds date and the one-in-ten date is wider than at 94% of the 339 Texas 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 December 23 in half of years, as early as November 28 one year in ten, and holds off past January 28 one year in ten. A hard freeze of 28°F follows 10 days later, around January 2; in spring the one-in-ten date for 28°F is February 20, 12 days before the 32°F one. The freeze-free season lasts 328 days in a typical year, longer than at 94% of the 339 Texas stations; it reaches 365 days one year in ten and falls short of 288 one year in ten. On average 5 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 21 days longer, to about February 21, and return around December 4. A 24°F night is unusual: 16% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F99% of yrs | Jan 20 | Jan 31 | Feb 9 | Feb 16 | Feb 21 | Feb 28 | Mar 3 | Mar 8 | Mar 16 |
| 32°F89% of yrs | Dec 22 | Jan 4 | Jan 15 | Jan 25 | Jan 31 | Feb 7 | Feb 15 | Feb 25 | Mar 4 |
| 28°F50% of yrs | Dec 16 | Dec 27 | Jan 2 | Jan 7 | Jan 13 | Jan 23 | Jan 31 | Feb 8 | Feb 20 |
| 24°F16% of yrs | too rare for a date | ||||||||
| 20°F2% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F99% of yrs | Nov 14 | Nov 20 | Nov 25 | Nov 30 | Dec 4 | Dec 7 | Dec 12 | Dec 20 | Jan 2 |
| 32°F89% of yrs | Nov 28 | Dec 4 | Dec 9 | Dec 15 | Dec 23 | Dec 29 | Jan 3 | Jan 11 | Jan 28 |
| 28°F50% of yrs | Dec 7 | Dec 15 | Dec 23 | Dec 29 | Jan 2 | Jan 6 | Jan 15 | Jan 25 | Feb 7 |
| 24°F16% of yrs | too rare for a date | ||||||||
| 20°F2% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Mathis 4 SSW, 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 78372 →Compare Orange Grove with another place →
Weather by month in Orange Grove
August is the warmest month at Mathis 4 SSW, TX, averaging 96°F by day and 74°F at night; January is the coldest at 66°F and 45°F. From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 37% of years and March still brings one in 12% of years.
Warmth for growing adds up to 7,846 growing degree days a year (base 50°F), more than at 87% of the 351 Texas stations. 43% of them (3,411) have built up by the end of June, and August adds the most, 1,074. Precipitation totals 27.6 inches a year, most in September (3.8") and least in February (1.2"); May to September bring 52% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 66 | 45 | 1.5 | 56% | 2 | 209 |
| Feb | 70 | 48 | 1.2 | 37% | 1 | 280 |
| Mar | 75 | 55 | 2.3 | 12% | <1 | 474 |
| Apr | 82 | 60 | 1.7 | 0% | 0 | 628 |
| May | 87 | 68 | 3.0 | 0% | 0 | 848 |
| Jun | 92 | 73 | 2.6 | 0% | 0 | 973 |
| Jul | 94 | 73 | 2.6 | 0% | 0 | 1049 |
| Aug | 96 | 74 | 2.3 | 0% | 0 | 1074 |
| Sep | 90 | 71 | 3.8 | 0% | 0 | 912 |
| Oct | 84 | 62 | 2.9 | 0% | 0 | 720 |
| Nov | 75 | 53 | 1.9 | 12% | <1 | 427 |
| Dec | 67 | 47 | 1.8 | 51% | 1 | 253 |
Monthly normals 1991–2020 at Mathis 4 SSW, TX (138 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, Alice, TX, 16 miles south of Orange Grove, has a last frost 2 days earlier (January 29), a first frost 6 days later (December 29), a season 9 days longer.
When it snows in Orange Grove, Texas
Measurable snow is rare here: only 0 of 24 winters from 1991 to 2020 recorded 0.1 inch or more at Mathis 4 SSW, TX, 13.1 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 78372 is 13 miles from Mathis 4 SSW, TX, which stands at 138 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 78368 (Mathis). The 2023 USDA Plant Hardiness Zone Map lists ZIP 78372 in zone 9b, the band where the coldest night of the year averaged 25 to 30°F (-3.9 to -1.1°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.