USDA Hardiness Zone 9a
Frost Dates for 77807 — Bryan, Texas
NOAA 1991–2020 normals from College Stn, TX (305 ft), 9 miles southeast.
Updated
In Bryan, the last spring frost (32°F) is around February 27 in half of years and has passed by March 18 in nine years out of ten. The first fall frost comes around November 30, as early as November 10 one year in ten, leaving a typical freeze-free season of 278 days (NOAA, College Stn, TX).
- Last spring frost
- February 27
- First fall frost
- November 30
- Growing season
- 278 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
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 20 observed
NOAA normal
Frost risk by date in Bryan
Half of springs at College Stn, TX see their last 32°F night by February 27; only one in ten is past it by January 31, and one in ten still has one after March 18. Planting tender crops after March 6 leaves a 30% risk of a frost on them, after March 12 20%, and after March 18 10%. The 19 days between the even-odds date and the one-in-ten date is narrower than at 63% of the 339 Texas stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 30 in half of years, as early as November 10 one year in ten, and holds off past December 26 one year in ten. A hard freeze of 28°F follows 18 days later, around December 18; in spring the one-in-ten date for 28°F is March 9, 9 days before the 32°F one. The freeze-free season lasts 278 days in a typical year, longer than at 77% of the 339 Texas stations; it reaches 315 days one year in ten and falls short of 247 one year in ten. On average 16 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 12 days longer, to about March 11, and return around November 17. Nights of 24°F, cold enough to damage hardier plants, come in 66% of winters and 16°F in 6%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Feb 22 | Feb 28 | Mar 3 | Mar 7 | Mar 11 | Mar 15 | Mar 20 | Mar 27 | Apr 2 |
| 32°F | Jan 31 | Feb 8 | Feb 16 | Feb 22 | Feb 27 | Mar 3 | Mar 6 | Mar 12 | Mar 18 |
| 28°F95% of yrs | Jan 6 | Jan 19 | Jan 25 | Jan 31 | Feb 7 | Feb 14 | Feb 24 | Mar 2 | Mar 9 |
| 24°F66% of yrs | Dec 21 | Jan 1 | Jan 10 | Jan 18 | Jan 23 | Jan 31 | Feb 7 | Feb 15 | Mar 1 |
| 20°F25% of yrs | too rare for a date | ||||||||
| 16°F6% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Nov 1 | Nov 6 | Nov 10 | Nov 14 | Nov 17 | Nov 21 | Nov 24 | Nov 29 | Dec 5 |
| 32°F | Nov 10 | Nov 17 | Nov 22 | Nov 26 | Nov 30 | Dec 3 | Dec 8 | Dec 15 | Dec 26 |
| 28°F95% of yrs | Nov 23 | Nov 30 | Dec 5 | Dec 10 | Dec 18 | Dec 25 | Jan 1 | Jan 8 | Jan 22 |
| 24°F66% of yrs | Dec 5 | Dec 13 | Dec 23 | Dec 31 | Jan 3 | Jan 10 | Jan 18 | Jan 27 | Feb 12 |
| 20°F25% of yrs | too rare for a date | ||||||||
| 16°F6% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at College Stn, 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 77807 →Compare Bryan with another place →
Weather by month in Bryan
August is the warmest month at College Stn, TX, averaging 97°F by day and 75°F at night; January is the coldest at 62°F and 41°F. A freezing night is all but certain in 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 77% of years and March still brings one in 46% of years.
Warmth for growing adds up to 7,355 growing degree days a year (base 50°F), more than at 76% of the 351 Texas stations. 42% of them (3,082) have built up by the end of June, and August adds the most, 1,105. Precipitation totals 41.7 inches a year, most in October (4.9") and least in July (2.0"); May to September bring 41% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 62 | 41 | 3.4 | 94% | 6 | 141 |
| Feb | 66 | 45 | 2.9 | 77% | 3 | 198 |
| Mar | 73 | 52 | 3.4 | 46% | 1 | 389 |
| Apr | 79 | 58 | 2.9 | 1% | 0 | 560 |
| May | 86 | 66 | 4.6 | 0% | 0 | 817 |
| Jun | 92 | 73 | 4.0 | 0% | 0 | 978 |
| Jul | 95 | 75 | 2.0 | 0% | 0 | 1090 |
| Aug | 97 | 75 | 3.1 | 0% | 0 | 1105 |
| Sep | 91 | 70 | 3.5 | 0% | 0 | 918 |
| Oct | 82 | 60 | 4.9 | 1% | <1 | 654 |
| Nov | 71 | 50 | 3.3 | 50% | 1 | 336 |
| Dec | 63 | 43 | 3.7 | 88% | 5 | 171 |
Monthly normals 1991–2020 at College Stn, TX (305 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, Franklin, TX, 24 miles north of Bryan and 162 feet higher, has a last frost 1 day later (February 28), a first frost 2 days earlier (November 28), a season 1 day shorter.
When it snows in Bryan, Texas
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Caldwell, TX, 17.8 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 77807
| When | What to do |
|---|---|
| December 19 – January 2 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| January 2 – January 16 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| January 30 – February 13 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| February 27 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by September 7 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by November 16 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 30 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 77807 is 9 miles from College Stn, TX, which stands at 305 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 7 other ZIP codes share the station; its figures are presented in full for 77845 (College Station). The 2023 USDA Plant Hardiness Zone Map lists ZIP 77807 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.