USDA Hardiness Zone 10a
Frost Dates for 78557 — Hidalgo, Texas
NOAA 1991–2020 normals from Mcallen Miller International Airport, TX (100 ft), 5 miles north.
Updated
Frost is not a yearly event in Hidalgo: a night at or below 32°F came in 29% of the winters of 1991–2020 at Mcallen Miller International Airport, TX, and a 36°F night, cold enough for frost on exposed leaves, in 74%. There is no reliable "last frost date" here; most years have none.
- Winters with a freeze
- 29%
- Winters with 36°F
- 74%
- Coldest month low
- 53°F
- Hardiness zone
- 10a
32°F or below, 1991–2020
frost possible on leaves
average, January
30 to 35°F (-1.1 to 1.7°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 5%
- Snow per year
- 0.1"
median, 1991–2020
median, 1991–2020
1 of 19 observed
NOAA normal
Frost risk by date in Hidalgo
At Mcallen Miller International Airport, TX, 5 miles north of Hidalgo, 29% of the winters of 1991–2020 had at least one night at or below 32°F, 6% reached 28°F. Nights of 36°F, enough for frost on exposed leaves, are more common (74% of winters) and, when they come, fall between about December 29 and January 19. January is the month most likely to bring one: a 13% chance in a given year. 11 of the 351 other Texas stations behind this site's ZIP pages freeze in fewer than half of winters too.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F74% of yrs | Dec 17 | Dec 28 | Jan 4 | Jan 11 | Jan 19 | Jan 29 | Feb 4 | Feb 12 | Feb 22 |
| 32°F29% of yrs | too rare for a date | ||||||||
| 28°F6% of yrs | too rare for a date | ||||||||
| 24°F0% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F74% of yrs | Nov 30 | Dec 9 | Dec 16 | Dec 23 | Dec 29 | Jan 2 | Jan 8 | Jan 15 | Feb 5 |
| 32°F29% of yrs | too rare for a date | ||||||||
| 28°F6% of yrs | too rare for a date | ||||||||
| 24°F0% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Mcallen Miller International 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 78557 →Compare Hidalgo with another place →
Weather by month in Hidalgo
August is the warmest month at Mcallen Miller International Airport, TX, averaging 100°F by day and 79°F at night; January is the coldest at 73°F and 53°F. From February to November the chance of a 32°F night stays under 10% each month.
Warmth for growing adds up to 10,039 growing degree days a year (base 50°F), the most of the 351 Texas stations. 46% of them (4,630) have built up by the end of June, and August adds the most, 1,217. Precipitation totals 22.2 inches a year, most in September (4.6") and least in February (0.7"); May to September bring 61% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 73 | 53 | 0.8 | 13% | <1 | 408 |
| Feb | 77 | 57 | 0.7 | 8% | <1 | 485 |
| Mar | 83 | 63 | 1.4 | 0% | 0 | 712 |
| Apr | 88 | 68 | 1.4 | 0% | 0 | 852 |
| May | 93 | 74 | 2.0 | 0% | 0 | 1042 |
| Jun | 97 | 78 | 3.1 | 0% | 0 | 1131 |
| Jul | 99 | 79 | 2.0 | 0% | 0 | 1198 |
| Aug | 100 | 79 | 1.8 | 0% | 0 | 1217 |
| Sep | 94 | 76 | 4.6 | 0% | 0 | 1049 |
| Oct | 89 | 69 | 2.1 | 0% | 0 | 899 |
| Nov | 80 | 60 | 1.2 | 1% | 0 | 606 |
| Dec | 74 | 54 | 1.1 | 11% | <1 | 441 |
Monthly normals 1991–2020 at Mcallen Miller International Airport, TX (100 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, Mcallen, TX, 6 miles north of Hidalgo, has a 32°F night in 48% of winters against 29% here, and a coolest-month low 4°F colder (49°F).
When it snows in Hidalgo, Texas
Measurable snow is rare here: only 1 of 19 winters from 1991 to 2020 recorded 0.1 inch or more at Mcallen, TX, 5.9 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 78557 is 5 miles from Mcallen Miller International Airport, TX, which stands at 100 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 78503 (Mcallen). The 2023 USDA Plant Hardiness Zone Map lists ZIP 78557 in zone 10a, the band where the coldest night of the year averaged 30 to 35°F (-1.1 to 1.7°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.