USDA Hardiness Zone 10a
Frost Dates for 34986 — Port St Lucie, Florida
NOAA 1991–2020 normals from Fort Pierce, FL (25 ft), 8 miles northeast.
Updated
Frost is not a yearly event in Port St Lucie: a night at or below 32°F came in 33% of the winters of 1991–2020 at Fort Pierce, FL, and a 36°F night, cold enough for frost on exposed leaves, in 69%. There is no reliable "last frost date" here; most years have none.
- Winters with a freeze
- 33%
- Winters with 36°F
- 69%
- 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 20 observed
NOAA normal
Frost risk by date in Port St Lucie
At Fort Pierce, FL, 8 miles northeast of Port St Lucie, 33% of the winters of 1991–2020 had at least one night at or below 32°F, 8% reached 28°F. Nights of 36°F, enough for frost on exposed leaves, are more common (69% of winters) and, when they come, fall between about January 8 and January 31. January is the month most likely to bring one: a 19% 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°F69% of yrs | Dec 29 | Jan 6 | Jan 14 | Jan 21 | Jan 31 | Feb 3 | Feb 10 | Feb 22 | Mar 7 |
| 32°F33% of yrs | too rare for a date | ||||||||
| 28°F8% 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°F69% of yrs | Dec 14 | Dec 23 | Dec 28 | Jan 2 | Jan 8 | Jan 14 | Jan 24 | Feb 1 | Feb 13 |
| 32°F33% of yrs | too rare for a date | ||||||||
| 28°F8% of yrs | too rare for a date | ||||||||
| 24°F0% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Fort Pierce, 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 34986 →Compare Port St Lucie with another place →
Weather by month in Port St Lucie
August is the warmest month at Fort Pierce, FL, averaging 89°F by day and 75°F at night; January is the coldest at 72°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 8,589 growing degree days a year (base 50°F), more than at 62% of the 158 Florida stations. 44% of them (3,778) have built up by the end of June, and August adds the most, 989. Precipitation totals 55.8 inches a year, most in September (8.2") and least in December (2.4"); May to September bring 58% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 72 | 53 | 3.0 | 19% | 1 | 402 |
| Feb | 74 | 55 | 2.8 | 9% | <1 | 419 |
| Mar | 77 | 59 | 3.0 | 3% | <1 | 551 |
| Apr | 81 | 64 | 3.6 | 0% | 0 | 671 |
| May | 84 | 69 | 4.2 | 0% | 0 | 828 |
| Jun | 88 | 73 | 6.2 | 0% | 0 | 908 |
| Jul | 89 | 74 | 6.2 | 0% | 0 | 981 |
| Aug | 89 | 75 | 7.3 | 0% | 0 | 989 |
| Sep | 88 | 74 | 8.2 | 0% | 0 | 923 |
| Oct | 84 | 70 | 5.7 | 0% | 0 | 828 |
| Nov | 78 | 62 | 3.2 | 0% | 0 | 608 |
| Dec | 74 | 57 | 2.4 | 8% | <1 | 484 |
Monthly normals 1991–2020 at Fort Pierce, FL (25 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, Fort Pierce St Lucie Co International Airport, FL, 11 miles north of Port St Lucie, has a 32°F night in 49% of winters against 33% here, and a coolest-month low 2°F colder (51°F).
When it snows in Port St Lucie, Florida
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Fort Pierce, FL, 7.5 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 34986 is 8 miles from Fort Pierce, FL, which stands at 25 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 34986 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.