USDA Hardiness Zone 6a
Frost Dates for 64485 — Savannah, Missouri
NOAA 1991–2020 normals from Cosby 2W, MO (910 ft), 9 miles southeast.
Updated
In Savannah, the last spring frost (32°F) is around April 17 in half of years and has passed by May 1 in nine years out of ten. The first fall frost comes around October 19, as early as October 4 one year in ten, leaving a typical freeze-free season of 184 days (NOAA, Cosby 2W, MO).
- Last spring frost
- April 17
- First fall frost
- October 19
- Growing season
- 184 days
- Hardiness zone
- 6a
50% probability
50% probability
freeze-free, 50%
-10 to -5°F (-23.3 to -20.6°C) coldest night
- First snow
- December 1
- Last snow
- March 21
- Winters with snow
- 100%
- Snow per year
- 21.1"
median, 1991–2020
median, 1991–2020
30 of 30 observed
NOAA normal
Frost risk by date in Savannah
Half of springs at Cosby 2W, MO see their last 32°F night by April 17; only one in ten is past it by April 3, and one in ten still has one after May 1. Planting tender crops after April 23 leaves a 30% risk of a frost on them, after April 26 20%, and after May 1 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 80% of the 158 Missouri stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 19 in half of years, as early as October 4 one year in ten, and holds off past October 30 one year in ten. A hard freeze of 28°F follows 9 days later, around October 28; in spring the one-in-ten date for 28°F is April 21, 10 days before the 32°F one. The freeze-free season lasts 184 days in a typical year, shorter than at 81% of the 158 Missouri stations; it reaches 203 days one year in ten and falls short of 166 one year in ten. On average 130 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 11 days longer, to about April 28, and return around October 9. Severe cold of 16°F or below comes every winter, usually between November 26 and March 8.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 14 | Apr 18 | Apr 22 | Apr 25 | Apr 28 | Apr 30 | May 3 | May 6 | May 9 |
| 32°F | Apr 3 | Apr 8 | Apr 11 | Apr 14 | Apr 17 | Apr 20 | Apr 23 | Apr 26 | May 1 |
| 28°F | Mar 22 | Mar 30 | Apr 1 | Apr 4 | Apr 7 | Apr 10 | Apr 13 | Apr 16 | Apr 21 |
| 24°F | Mar 9 | Mar 16 | Mar 20 | Mar 24 | Mar 28 | Mar 31 | Apr 3 | Apr 7 | Apr 12 |
| 20°F | Mar 2 | Mar 6 | Mar 11 | Mar 14 | Mar 18 | Mar 21 | Mar 24 | Mar 29 | Apr 2 |
| 16°F | Feb 21 | Feb 27 | Mar 2 | Mar 5 | Mar 8 | Mar 11 | Mar 15 | Mar 19 | Mar 27 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 25 | Sep 30 | Oct 3 | Oct 6 | Oct 9 | Oct 12 | Oct 15 | Oct 18 | Oct 22 |
| 32°F | Oct 4 | Oct 10 | Oct 14 | Oct 17 | Oct 19 | Oct 22 | Oct 24 | Oct 27 | Oct 30 |
| 28°F | Oct 16 | Oct 20 | Oct 23 | Oct 26 | Oct 28 | Oct 31 | Nov 1 | Nov 5 | Nov 9 |
| 24°F | Oct 24 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 8 | Nov 11 | Nov 15 | Nov 20 |
| 20°F | Nov 1 | Nov 5 | Nov 9 | Nov 12 | Nov 15 | Nov 18 | Nov 22 | Nov 26 | Dec 2 |
| 16°F | Nov 9 | Nov 14 | Nov 18 | Nov 22 | Nov 26 | Nov 29 | Dec 3 | Dec 7 | Dec 14 |
Freeze probabilities 1991–2020 at Cosby 2W, MO, 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 64485 →Compare Savannah with another place →
Weather by month in Savannah
July is the warmest month at Cosby 2W, MO, averaging 87°F by day and 67°F at night; January is the coldest at 35°F and 16°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 11% of years.
Warmth for growing adds up to 3,638 growing degree days a year (base 50°F), fewer than at 87% of the 158 Missouri stations. 36% of them (1,305) have built up by the end of June, and July adds the most, 835.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 35 | 16 | 100% | 30 | 0 |
| Feb | 40 | 19 | 100% | 26 | 6 |
| Mar | 53 | 30 | 100% | 18 | 49 |
| Apr | 64 | 40 | 94% | 6 | 150 |
| May | 73 | 52 | 11% | 0 | 403 |
| Jun | 84 | 63 | 0% | 0 | 697 |
| Jul | 87 | 67 | 0% | 0 | 835 |
| Aug | 85 | 64 | 0% | 0 | 759 |
| Sep | 79 | 55 | 6% | <1 | 508 |
| Oct | 66 | 42 | 91% | 6 | 200 |
| Nov | 51 | 31 | 100% | 17 | 30 |
| Dec | 40 | 21 | 100% | 28 | 1 |
Monthly normals 1991–2020 at Cosby 2W, MO (910 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 Joseph Rosecrans Airport, MO, 13 miles south of Savannah, has a last frost 2 days later (April 19), a first frost 2 days earlier (October 17), a season 4 days shorter.
When it snows in Savannah, Missouri
The first measurable snow (0.1 inch or more) in Savannah usually arrives around December 1, and the last of the season around March 21. Those are the middle dates across the winters of 1991–2020 at Troy 3N, KS, 15.7 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 27 days after the last snow.
Planting calendar for 64485
| When | What to do |
|---|---|
| February 6 – February 20 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 20 – March 6 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 20 – April 3 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 17 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 27 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 5 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 19 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 64485 is 9 miles from Cosby 2W, MO, which stands at 910 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 64485 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°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.