USDA Hardiness Zone 9a
Frost Dates for 77664 — Warren, Texas
NOAA 1991–2020 normals from Wildwood, TX (200 ft), 5 miles southwest.
Updated
In Warren, the last spring frost (32°F) is around March 6 in half of years and has passed by March 31 in nine years out of ten. The first fall frost comes around November 21, as early as November 3 one year in ten, leaving a typical freeze-free season of 261 days (NOAA, Wildwood, TX).
- Last spring frost
- March 6
- First fall frost
- November 21
- Growing season
- 261 days
- Hardiness zone
- 9a
50% probability
50% probability
freeze-free, 50%
20 to 25°F (-6.7 to -3.9°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 13%
- Snow per year
- 0.1"
median, 1991–2020
median, 1991–2020
3 of 23 observed
NOAA normal
Frost risk by date in Warren
Half of springs at Wildwood, TX see their last 32°F night by March 6; only one in ten is past it by February 9, and one in ten still has one after March 31. Planting tender crops after March 15 leaves a 30% risk of a frost on them, after March 21 20%, and after March 31 10%. The 25 days between the even-odds date and the one-in-ten date is wider than at 82% 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 November 21 in half of years, as early as November 3 one year in ten, and holds off past December 10 one year in ten. A hard freeze of 28°F follows 14 days later, around December 5; in spring the one-in-ten date for 28°F is March 15, 16 days before the 32°F one. The freeze-free season lasts 261 days in a typical year, longer than at 65% of the 339 Texas stations; it reaches 291 days one year in ten and falls short of 232 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 17 days longer, to about March 23, and return around November 10. Nights of 24°F, cold enough to damage hardier plants, come in 83% of winters and 16°F in 11%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Feb 28 | Mar 8 | Mar 13 | Mar 17 | Mar 23 | Mar 29 | Apr 2 | Apr 7 | Apr 15 |
| 32°F | Feb 9 | Feb 18 | Feb 25 | Feb 28 | Mar 6 | Mar 11 | Mar 15 | Mar 21 | Mar 31 |
| 28°F99% of yrs | Jan 15 | Jan 27 | Feb 1 | Feb 8 | Feb 16 | Feb 23 | Feb 28 | Mar 7 | Mar 15 |
| 24°F83% of yrs | Dec 26 | Jan 6 | Jan 15 | Jan 22 | Jan 29 | Feb 1 | Feb 7 | Feb 19 | Mar 4 |
| 20°F39% of yrs | too rare for a date | ||||||||
| 16°F11% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 27 | Nov 1 | Nov 3 | Nov 6 | Nov 10 | Nov 14 | Nov 18 | Nov 24 | Dec 1 |
| 32°F | Nov 3 | Nov 7 | Nov 12 | Nov 16 | Nov 21 | Nov 25 | Dec 1 | Dec 4 | Dec 10 |
| 28°F99% of yrs | Nov 12 | Nov 20 | Nov 26 | Dec 1 | Dec 5 | Dec 9 | Dec 17 | Dec 26 | Jan 4 |
| 24°F83% of yrs | Nov 28 | Dec 5 | Dec 12 | Dec 21 | Dec 29 | Jan 2 | Jan 8 | Jan 16 | Feb 1 |
| 20°F39% of yrs | too rare for a date | ||||||||
| 16°F11% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Wildwood, 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 77664 →Compare Warren with another place →
Weather by month in Warren
July is the warmest month at Wildwood, TX, averaging 95°F by day and 73°F at night; January is the coldest at 63°F and 38°F. A freezing night is all but certain in every month from December to January (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 86% of years and March still brings one in 56% of years.
Warmth for growing adds up to 6,881 growing degree days a year (base 50°F), more than at 66% of the 351 Texas stations. 42% of them (2,886) have built up by the end of June, and July adds the most, 1,042. Precipitation totals 57.0 inches a year, most in June (5.8") and least in February (4.1"); May to September bring 41% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 63 | 38 | 4.7 | 98% | 13 | 118 |
| Feb | 66 | 42 | 4.1 | 86% | 9 | 165 |
| Mar | 73 | 49 | 4.1 | 56% | 3 | 356 |
| Apr | 80 | 55 | 4.5 | 8% | <1 | 526 |
| May | 87 | 64 | 4.5 | 0% | 0 | 784 |
| Jun | 92 | 70 | 5.8 | 0% | 0 | 937 |
| Jul | 95 | 73 | 4.1 | 0% | 0 | 1042 |
| Aug | 95 | 72 | 4.3 | 0% | 0 | 1037 |
| Sep | 90 | 67 | 4.5 | 0% | 0 | 861 |
| Oct | 83 | 56 | 5.6 | 5% | 0 | 598 |
| Nov | 72 | 47 | 5.4 | 68% | 3 | 302 |
| Dec | 64 | 40 | 5.4 | 93% | 9 | 155 |
Monthly normals 1991–2020 at Wildwood, TX (200 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, Town Bluff Dam, TX, 19 miles northeast of Warren, has a last frost 3 days later (March 9), a first frost 1 day later (November 22), a season 3 days shorter.
When it snows in Warren, Texas
Measurable snow is rare here: only 3 of 23 winters from 1991 to 2020 recorded 0.1 inch or more at Wildwood, TX, 5.1 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 77664
| When | What to do |
|---|---|
| December 26 – January 9 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| January 9 – January 23 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| February 6 – February 20 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 6 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 29 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by November 7 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 21 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 77664 is 5 miles from Wildwood, TX, which stands at 200 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 77664 in zone 9a, the band where the coldest night of the year averaged 20 to 25°F (-6.7 to -3.9°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.