USDA Hardiness Zone 9b
Frost Dates for 77619 — Groves, Texas
NOAA 1991–2020 normals from Port Arthur SE Tx Airport, TX (16 ft), 6 miles west.
Updated
In Groves, the last spring frost (32°F) is around February 14 in half of years and has passed by March 13 in nine years out of ten. The first fall frost comes around December 7, as early as November 15 one year in ten, leaving a typical freeze-free season of 301 days (NOAA, Port Arthur SE Tx Airport, TX).
- Last spring frost
- February 14
- First fall frost
- December 7
- Growing season
- 301 days
- Hardiness zone
- 9b
50% probability
50% probability
freeze-free, 50%
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 20 observed
NOAA normal
Frost risk by date in Groves
Half of springs at Port Arthur SE Tx Airport, TX see their last 32°F night by February 14; only one in ten is past it by January 17, and one in ten still has one after March 13. Planting tender crops after February 27 leaves a 30% risk of a frost on them, after March 4 20%, and after March 13 10%. The 27 days between the even-odds date and the one-in-ten date is wider than at 86% 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 7 in half of years, as early as November 15 one year in ten, and holds off past January 9 one year in ten. A hard freeze of 28°F follows 25 days later, around January 1; in spring the one-in-ten date for 28°F is March 3, 10 days before the 32°F one. The freeze-free season lasts 301 days in a typical year, longer than at 88% of the 339 Texas stations; it reaches 338 days one year in ten and falls short of 263 one year in ten. On average 8 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 18 days longer, to about March 4, and return around November 23. A 24°F night is unusual: 38% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Feb 5 | Feb 17 | Feb 23 | Feb 28 | Mar 4 | Mar 8 | Mar 13 | Mar 18 | Mar 27 |
| 32°F99% of yrs | Jan 17 | Jan 27 | Feb 1 | Feb 7 | Feb 14 | Feb 21 | Feb 27 | Mar 4 | Mar 13 |
| 28°F79% of yrs | Dec 23 | Jan 7 | Jan 14 | Jan 22 | Jan 28 | Feb 2 | Feb 10 | Feb 20 | Mar 3 |
| 24°F38% of yrs | too rare for a date | ||||||||
| 20°F7% of yrs | too rare for a date | ||||||||
| 16°F1% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Nov 3 | Nov 10 | Nov 15 | Nov 19 | Nov 23 | Nov 27 | Dec 1 | Dec 4 | Dec 12 |
| 32°F99% of yrs | Nov 15 | Nov 23 | Nov 29 | Dec 2 | Dec 7 | Dec 13 | Dec 22 | Jan 1 | Jan 9 |
| 28°F79% of yrs | Dec 1 | Dec 8 | Dec 16 | Dec 27 | Jan 1 | Jan 5 | Jan 10 | Jan 19 | Feb 3 |
| 24°F38% of yrs | too rare for a date | ||||||||
| 20°F7% of yrs | too rare for a date | ||||||||
| 16°F1% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Port Arthur SE Tx Airport, 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 77619 →Compare Groves with another place →
Weather by month in Groves
August is the warmest month at Port Arthur SE Tx Airport, TX, averaging 93°F by day and 74°F at night; January is the coldest at 64°F and 44°F. From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 58% of years and March still brings one in 26% of years.
Warmth for growing adds up to 7,445 growing degree days a year (base 50°F), more than at 79% of the 351 Texas stations. 43% of them (3,196) have built up by the end of June, and August adds the most, 1,046. Precipitation totals 62.2 inches a year, most in July (6.9") and least in February (3.1"); May to September bring 51% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 64 | 44 | 5.3 | 81% | 4 | 178 |
| Feb | 67 | 48 | 3.1 | 58% | 1 | 239 |
| Mar | 73 | 53 | 3.6 | 26% | 1 | 419 |
| Apr | 79 | 60 | 3.9 | 0% | 0 | 579 |
| May | 86 | 67 | 4.7 | 0% | 0 | 822 |
| Jun | 91 | 73 | 6.7 | 0% | 0 | 960 |
| Jul | 93 | 75 | 6.9 | 0% | 0 | 1042 |
| Aug | 93 | 74 | 6.9 | 0% | 0 | 1046 |
| Sep | 90 | 71 | 6.7 | 0% | 0 | 901 |
| Oct | 82 | 61 | 5.5 | 1% | 0 | 670 |
| Nov | 72 | 52 | 3.9 | 33% | 1 | 368 |
| Dec | 66 | 46 | 5.0 | 65% | 2 | 222 |
Monthly normals 1991–2020 at Port Arthur SE Tx Airport, TX (16 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, Beaumont City, TX, 15 miles northwest of Groves, has the same 50% last-frost date, a first frost 3 days earlier (December 4), a season 2 days shorter.
When it snows in Groves, Texas
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Port Arthur City, TX, 4.3 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 77619
| When | What to do |
|---|---|
| December 6 – December 20 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| December 20 – January 3 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| January 17 – January 31 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| February 14 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by September 14 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by November 23 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| December 7 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 77619 is 6 miles from Port Arthur SE Tx Airport, TX, which stands at 16 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 5 other ZIP codes share the station; its figures are presented in full for 77642 (Port Arthur). The 2023 USDA Plant Hardiness Zone Map lists ZIP 77619 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.