Frost dates for Port St. Lucie, Florida
Port St. Lucie doesn't get a freezing night every winter: about 49 years in 100 have one. In those years, half have had their last frost by January 24 and half their first by January 14.
Frost dates for
Port St. Lucie, Florida
Last spring frost
January 24
Not every winter has one: about 49 years in 100 have a freezing night here. In those years, half have their last frost by this date, and 1 in 10 still have one after February 21.
First fall frost
January 14
In years with a freeze, half have their first one by this date, and 1 in 10 by December 23.
Growing season
All year
In a typical year there is no freezing night at all. 9 years in 10 get at least 325 frost-free days in a row.
Hardiness zone
10a
2023 USDA map: the coldest night of winter averages 30°F to 35°F. It was 10a on the 2012 map too. All 5 ZIP codes within about 6 miles of the city's center are in zone 10a.
Print a year planner for Port St. Lucie
Frost risk through the year
How sure are these dates?
A frost date is a probability, not a promise. NOAA worked out, from 30 years of nightly lows, how often the last spring frost and the first fall frost fall on each date. The middle column is the typical year. The outer columns are the early and late years that come about once a decade.
| Early year 1 in 10 | Typical year 1 in 2 | Late year 1 in 10 | |
|---|---|---|---|
| Last frost in spring | January 1 | January 24 | February 21 |
| First frost in fall | December 23 | January 14 | February 13 |
In a typical year there is no freezing night at all. In 1 year in 10, the longest frost-free stretch is 325 days or shorter.
- Hard freeze (28°F): about 17 years in 100 have one. In those years the last typically comes on January 18 and the first on January 14. It is a harder freeze than the 32°F frost line, cold enough to damage many garden plants; how hardy a crop is decides whether it comes through. (The National Weather Service's own hard-freeze threshold varies from office to office.)
- Frost possible (36°F at the station): about 87 years in 100 have one. In those years the last typically comes on February 3 and the first on January 6. On clear, still nights the ground can be several degrees colder than the thermometer, so frost can form on plants when the official reading is in the mid-30s.
Planting calendar for Port St. Lucie
These dates count from the typical last and first frosts, using the planting rules published by Colorado State University Extension (spring), Virginia Cooperative Extension (fall crops) and University of Minnesota Extension (garlic, where winters are hard). Weather in any one year can run early or late, so check the forecast before you plant tender crops.
Frost comes in fewer than half of years here (about 49 years in 100), so we don't build a planting calendar around it: in most years there is no last frost to plant after. Your county's extension office publishes planting dates made for your climate.
For spring bulbs such as tulips and daffodils, plant once the soil has cooled to about 50 to 55°F and keep going until a couple of weeks before the ground freezes. Our guide to fall planting explains how to tell.
Where these numbers come from
These dates come from NOAA's weather station Fort Pierce St Lucie Co International Airport (station USW00012895), 15 miles from the center of Port St. Lucie. It sits at about the same elevation, 20 feet above sea level. NOAA rates this station's record as representative: at least 10 of the 30 years, with the gaps filled from nearby stations.
The same station also gives the frost dates for Fort Pierce.
Our ZIP code lookup matches these 3 ZIP codes to the same station, so they get the same dates: 34945, 34946, 34951. Hardiness zones are worked out separately for each ZIP code.
Nearby places
- Palm Bay, Florida: frost not every year (50 miles away)
- Orlando, Florida: frost not every year (100 miles away)
- Cape Coral, Florida: frost not every year (110 miles away)
See frost dates across Florida, or look up your own ZIP code for the station nearest you. Want the background? Read what a last frost date really means.