USDA Hardiness Zone 9b
Frost Dates for 32227 — Jacksonville, Florida
NOAA 1991–2020 normals from Mayport Pilot Stn, FL (16 ft), 1 miles north.
Updated
A freeze (32°F) reaches Jacksonville in 84% of winters. When it does, the first freeze of winter comes around January 5 and the last freeze of winter around February 1; after March 1 the chance of another is under 8%.
- Last freeze
- February 1
- First freeze
- January 5
- Winters with a freeze
- 84%
- Hardiness zone
- 9b
50%, in freezing years
50%, in freezing years
32°F or below, 1991–2020
25 to 30°F (-3.9 to -1.1°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 Jacksonville
In the 84% of winters that bring a 32°F night, half of winters at Mayport Pilot Stn, FL see their last 32°F night by February 1; only one in ten is past it by January 1, and one in ten still has one after March 1. Counting the winters with no freeze at all, the risk of a 32°F night after March 1 is under 8% and after February 1 42%. The 28 days between the even-odds date and the one-in-ten date is wider than at 67% of the 101 Florida 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 January 5 in half of years, as early as December 10 one year in ten, and holds off past February 7 one year in ten. A hard freeze of 28°F is less common: it came in 43% of winters. On average 3 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 February 18, and return around December 20. A 24°F night is unusual: 13% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F99% of yrs | Jan 20 | Jan 31 | Feb 6 | Feb 12 | Feb 18 | Feb 23 | Feb 28 | Mar 5 | Mar 14 |
| 32°F84% of yrs | Jan 1 | Jan 10 | Jan 18 | Jan 25 | Feb 1 | Feb 6 | Feb 12 | Feb 22 | Mar 1 |
| 28°F43% of yrs | too rare for a date | ||||||||
| 24°F13% of yrs | too rare for a date | ||||||||
| 20°F1% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F99% of yrs | Nov 27 | Dec 2 | Dec 7 | Dec 14 | Dec 20 | Dec 25 | Jan 1 | Jan 7 | Jan 18 |
| 32°F84% of yrs | Dec 10 | Dec 20 | Dec 26 | Jan 1 | Jan 5 | Jan 10 | Jan 16 | Jan 25 | Feb 7 |
| 28°F43% of yrs | too rare for a date | ||||||||
| 24°F13% of yrs | too rare for a date | ||||||||
| 20°F1% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Mayport Pilot Stn, 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 32227 →Compare Jacksonville with another place →
Weather by month in Jacksonville
July is the warmest month at Mayport Pilot Stn, FL, averaging 90°F by day and 75°F at night; January is the coldest at 64°F and 47°F. From March to November the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 35% of years.
Warmth for growing adds up to 7,434 growing degree days a year (base 50°F), fewer than at 66% of the 158 Florida stations. 42% of them (3,110) have built up by the end of June, and July adds the most, 1,009. Precipitation totals 48.6 inches a year, most in June (6.6") and least in November (2.3"); May to September bring 56% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 64 | 47 | 2.9 | 60% | 2 | 205 |
| Feb | 67 | 49 | 2.6 | 35% | 1 | 240 |
| Mar | 71 | 54 | 3.1 | 10% | <1 | 403 |
| Apr | 77 | 60 | 2.5 | 0% | 0 | 563 |
| May | 83 | 68 | 3.0 | 0% | 0 | 787 |
| Jun | 88 | 73 | 6.6 | 0% | 0 | 912 |
| Jul | 90 | 75 | 5.4 | 0% | 0 | 1009 |
| Aug | 89 | 75 | 6.0 | 0% | 0 | 998 |
| Sep | 86 | 73 | 6.4 | 0% | 0 | 889 |
| Oct | 80 | 66 | 5.0 | 0% | 0 | 716 |
| Nov | 72 | 57 | 2.3 | 1% | 0 | 436 |
| Dec | 66 | 50 | 2.8 | 31% | 1 | 276 |
Monthly normals 1991–2020 at Mayport Pilot Stn, FL (16 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, Jacksonville Beach, FL, 7 miles south of Jacksonville, has a last frost 1 day earlier (January 31), a first frost 5 days later (January 10), a season 13 days longer.
When it snows in Jacksonville, Florida
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Jacksonville Beach, FL, 6.7 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 32227 is 1 mile from Mayport Pilot Stn, FL, which stands at 16 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 32233 (Atlantic Beach). The 2023 USDA Plant Hardiness Zone Map lists ZIP 32227 in zone 9b, the band where the coldest night of the year averaged 25 to 30°F (-3.9 to -1.1°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.