USDA Hardiness Zone 9b
Frost Dates for 34607 — Spring Hill, Florida
NOAA 1991–2020 normals from Weeki Wachee, FL (20 ft), 2 miles east.
Updated
Spring Hill gets a freeze almost every winter, but late: the first 32°F night comes around January 1 and the last around February 5 in a typical year; nine years in ten are past it by March 5.
- Last freeze
- February 5
- First freeze
- January 1
- Growing season
- 322 days
- Hardiness zone
- 9b
50% probability
50% probability
freeze-free, 50%
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
- —
median, 1991–2020
median, 1991–2020
0 of 20 observed
NOAA normal
Frost risk by date in Spring Hill
Half of winters at Weeki Wachee, FL see their last 32°F night by February 5; only one in ten is past it by January 6, and one in ten still has one after March 5. Planting tender crops after February 18 leaves a 30% risk of a frost on them, after February 25 20%, and after March 5 10%. 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 1 in half of years, as early as December 1 one year in ten, and holds off past February 1 one year in ten. A hard freeze of 28°F follows 8 days later, around January 9; in spring the one-in-ten date for 28°F is February 18, 15 days before the 32°F one. On average 8 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 18 days longer, to about February 23, and return around December 9. A 24°F night is unusual: 20% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F99% of yrs | Jan 26 | Feb 4 | Feb 11 | Feb 17 | Feb 23 | Mar 1 | Mar 6 | Mar 14 | Mar 23 |
| 32°F90% of yrs | Jan 6 | Jan 17 | Jan 26 | Jan 31 | Feb 5 | Feb 12 | Feb 18 | Feb 25 | Mar 5 |
| 28°F59% of yrs | Dec 27 | Jan 5 | Jan 11 | Jan 17 | Jan 24 | Jan 31 | Feb 3 | Feb 9 | Feb 18 |
| 24°F20% 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 11 | Nov 21 | Nov 30 | Dec 4 | Dec 9 | Dec 17 | Dec 25 | Jan 2 | Jan 13 |
| 32°F90% of yrs | Dec 1 | Dec 8 | Dec 18 | Dec 24 | Jan 1 | Jan 4 | Jan 10 | Jan 17 | Feb 1 |
| 28°F59% of yrs | Dec 13 | Dec 24 | Dec 31 | Jan 4 | Jan 9 | Jan 14 | Jan 22 | Jan 31 | Feb 9 |
| 24°F20% of yrs | too rare for a date | ||||||||
| 20°F1% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Weeki Wachee, 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 34607 →Compare Spring Hill with another place →
Weather by month in Spring Hill
August is the warmest month at Weeki Wachee, FL, averaging 92°F by day and 74°F at night; January is the coldest at 72°F and 47°F. From April to November the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 47% of years and March still brings one in 13% of years.
Warmth for growing adds up to 8,329 growing degree days a year (base 50°F), more than at 53% of the 158 Florida stations. 44% of them (3,636) have built up by the end of June, and August adds the most, 1,021.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 72 | 47 | 67% | 4 | 320 |
| Feb | 74 | 51 | 47% | 1 | 361 |
| Mar | 78 | 55 | 13% | 1 | 516 |
| Apr | 84 | 60 | 0% | 0 | 653 |
| May | 88 | 66 | 0% | 0 | 839 |
| Jun | 91 | 73 | 0% | 0 | 948 |
| Jul | 92 | 74 | 0% | 0 | 1020 |
| Aug | 92 | 74 | 0% | 0 | 1021 |
| Sep | 91 | 72 | 0% | 0 | 948 |
| Oct | 86 | 65 | 0% | 0 | 787 |
| Nov | 79 | 55 | 8% | <1 | 519 |
| Dec | 74 | 51 | 41% | 2 | 398 |
Monthly normals 1991–2020 at Weeki Wachee, FL (20 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, Brooksville Hernando Co Airport, FL, 10 miles east of Spring Hill, has a last frost 24 days later (March 1), a first frost 27 days earlier (December 5), a season 41 days shorter.
When it snows in Spring Hill, Florida
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Weeki Wachee, FL, 2.3 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 34607 is 2 miles from Weeki Wachee, FL, which stands at 20 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station; its figures are presented in full for 34608 (Spring Hill). The 2023 USDA Plant Hardiness Zone Map lists ZIP 34607 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.