USDA Hardiness Zone 10a
Frost Dates for 33771 — Largo, Florida
NOAA 1991–2020 normals from St Petersburg International Airport, FL (11 ft), 4 miles east.
Updated
Frost is not a yearly event in Largo: a night at or below 32°F came in 23% of the winters of 1991–2020 at St Petersburg International Airport, FL, and a 36°F night, cold enough for frost on exposed leaves, in 63%. There is no reliable "last frost date" here; most years have none.
- Winters with a freeze
- 23%
- Winters with 36°F
- 63%
- 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
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 21 observed
NOAA normal
Frost risk by date in Largo
At St Petersburg International Airport, FL, 4 miles east of Largo, 23% of the winters of 1991–2020 had at least one night at or below 32°F, 3% reached 28°F. Nights of 36°F, enough for frost on exposed leaves, are more common (63% of winters) and, when they come, fall between about January 12 and January 23. January is the month most likely to bring one: a 17% chance in a given year. 56 of the 158 other Florida 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°F63% of yrs | Jan 1 | Jan 7 | Jan 13 | Jan 18 | Jan 23 | Jan 29 | Feb 2 | Feb 8 | Feb 17 |
| 32°F23% of yrs | too rare for a date | ||||||||
| 28°F3% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F63% of yrs | Dec 22 | Dec 31 | Jan 4 | Jan 7 | Jan 12 | Jan 17 | Jan 22 | Jan 28 | Feb 6 |
| 32°F23% of yrs | too rare for a date | ||||||||
| 28°F3% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at St Petersburg International Airport, FL, 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 33771 →Compare Largo with another place →
Weather by month in Largo
August is the warmest month at St Petersburg International Airport, FL, averaging 91°F by day and 76°F at night; January is the coldest at 71°F and 53°F. From February to December the chance of a 32°F night stays under 10% each month.
Warmth for growing adds up to 8,745 growing degree days a year (base 50°F), more than at 67% of the 158 Florida stations. 44% of them (3,863) have built up by the end of June, and August adds the most, 1,037. Precipitation totals 53.5 inches a year, most in July (9.7") and least in November (1.6"); May to September bring 68% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 71 | 53 | 2.6 | 17% | <1 | 368 |
| Feb | 73 | 55 | 2.4 | 5% | 0 | 399 |
| Mar | 77 | 59 | 2.4 | 0% | 0 | 561 |
| Apr | 82 | 64 | 2.6 | 0% | 0 | 690 |
| May | 87 | 70 | 2.7 | 0% | 0 | 882 |
| Jun | 90 | 75 | 8.9 | 0% | 0 | 963 |
| Jul | 90 | 76 | 9.7 | 0% | 0 | 1026 |
| Aug | 91 | 76 | 8.8 | 0% | 0 | 1037 |
| Sep | 89 | 75 | 6.4 | 0% | 0 | 962 |
| Oct | 84 | 70 | 2.5 | 0% | 0 | 835 |
| Nov | 77 | 61 | 1.6 | 0% | 0 | 572 |
| Dec | 73 | 56 | 2.9 | 3% | <1 | 451 |
Monthly normals 1991–2020 at St Petersburg International Airport, FL (11 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, St Petersburg, FL, 13 miles southeast of Largo, has a 32°F night in 11% of winters against 23% here, and a coolest-month low 1°F warmer (54°F).
When it snows in Largo, Florida
Measurable snow is rare here: only 0 of 21 winters from 1991 to 2020 recorded 0.1 inch or more at St Petersburg, FL, 12.7 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 33771 is 4 miles from St Petersburg International Airport, FL, which stands at 11 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 25 other ZIP codes share the station; its figures are presented in full for 33756 (Clearwater). The 2023 USDA Plant Hardiness Zone Map lists ZIP 33771 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.