USDA Hardiness Zone 8b
Frost Dates for 78006 — Boerne, Texas
NOAA 1991–2020 normals from Boerne, TX (1,445 ft), 4 miles south.
Updated
In Boerne, the last spring frost (32°F) is around March 15 in half of years and has passed by April 8 in nine years out of ten. The first fall frost comes around November 13, as early as October 31 one year in ten, leaving a typical freeze-free season of 243 days (NOAA, Boerne, TX).
- Last spring frost
- March 15
- First fall frost
- November 13
- Growing season
- 243 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
- 8%
- Snow per year
- 0.1"
median, 1991–2020
median, 1991–2020
2 of 25 observed
NOAA normal
Frost risk by date in Boerne
Half of springs at Boerne, TX see their last 32°F night by March 15; only one in ten is past it by February 23, and one in ten still has one after April 8. Planting tender crops after March 27 leaves a 30% risk of a frost on them, after April 1 20%, and after April 8 10%. The 24 days between the even-odds date and the one-in-ten date is wider than at 76% 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 13 in half of years, as early as October 31 one year in ten, and holds off past December 4 one year in ten. A hard freeze of 28°F follows 14 days later, around November 27; in spring the one-in-ten date for 28°F is March 23, 16 days before the 32°F one. The freeze-free season lasts 243 days in a typical year, shorter than at 56% of the 339 Texas stations; it reaches 270 days one year in ten and falls short of 216 one year in ten. On average 40 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 April 1, and return around November 4. Nights of 24°F, cold enough to damage hardier plants, come in 96% of winters and 16°F in 30%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 9 | Mar 16 | Mar 22 | Mar 29 | Apr 1 | Apr 5 | Apr 9 | Apr 15 | Apr 22 |
| 32°F | Feb 23 | Mar 2 | Mar 7 | Mar 12 | Mar 15 | Mar 20 | Mar 27 | Apr 1 | Apr 8 |
| 28°F | Jan 31 | Feb 12 | Feb 21 | Feb 28 | Mar 2 | Mar 7 | Mar 11 | Mar 15 | Mar 23 |
| 24°F96% of yrs | Dec 31 | Jan 17 | Jan 27 | Feb 4 | Feb 13 | Feb 21 | Feb 28 | Mar 4 | Mar 11 |
| 20°F70% of yrs | Dec 13 | Dec 29 | Jan 5 | Jan 14 | Jan 23 | Jan 31 | Feb 8 | Feb 17 | Mar 1 |
| 16°F30% 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 6 | Nov 10 | Nov 14 | Nov 21 |
| 32°F | Oct 31 | Nov 3 | Nov 6 | Nov 10 | Nov 13 | Nov 17 | Nov 22 | Nov 28 | Dec 4 |
| 28°F | Nov 5 | Nov 12 | Nov 17 | Nov 22 | Nov 27 | Dec 1 | Dec 5 | Dec 10 | Dec 21 |
| 24°F96% of yrs | Nov 17 | Nov 24 | Nov 30 | Dec 5 | Dec 11 | Dec 19 | Dec 27 | Jan 3 | Jan 15 |
| 20°F70% of yrs | Dec 1 | Dec 9 | Dec 17 | Dec 26 | Jan 1 | Jan 4 | Jan 12 | Jan 22 | Feb 10 |
| 16°F30% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Boerne, 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 78006 →Compare Boerne with another place →
Weather by month in Boerne
August is the warmest month at Boerne, TX, averaging 94°F by day and 71°F at night; January is the coldest at 62°F and 37°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 79% of years and April still brings one in 22% of years.
Warmth for growing adds up to 6,414 growing degree days a year (base 50°F), more than at 50% of the 351 Texas stations. 42% of them (2,675) have built up by the end of June, and August adds the most, 1,001. Precipitation totals 37.5 inches a year, most in May (5.3") and least in February (2.2"); May to September bring 50% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 62 | 37 | 2.3 | 99% | 13 | 100 |
| Feb | 66 | 41 | 2.2 | 94% | 8 | 154 |
| Mar | 72 | 47 | 2.8 | 79% | 3 | 324 |
| Apr | 79 | 54 | 2.5 | 22% | <1 | 492 |
| May | 84 | 63 | 5.3 | 0% | 0 | 724 |
| Jun | 90 | 69 | 3.8 | 0% | 0 | 882 |
| Jul | 93 | 71 | 2.8 | 0% | 0 | 984 |
| Aug | 94 | 71 | 2.8 | 0% | 0 | 1001 |
| Sep | 89 | 65 | 3.9 | 0% | 0 | 804 |
| Oct | 81 | 56 | 3.9 | 12% | <1 | 563 |
| Nov | 70 | 45 | 2.9 | 82% | 4 | 268 |
| Dec | 63 | 38 | 2.3 | 98% | 11 | 118 |
Monthly normals 1991–2020 at Boerne, TX (1,445 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, Blanco, TX, 25 miles northeast of Boerne, has a last frost 5 days later (March 20), a first frost 3 days earlier (November 10), a season 7 days shorter.
When it snows in Boerne, Texas
Measurable snow is rare here: only 2 of 25 winters from 1991 to 2020 recorded 0.1 inch or more at Boerne, TX, 3.7 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 78006
| When | What to do |
|---|---|
| January 4 – January 18 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| January 18 – February 1 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| February 15 – March 1 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 15 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 21 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 30 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 13 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 78006 is 4 miles from Boerne, TX, which stands at 1,445 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 78006 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.