USDA Hardiness Zone 6b
Frost Dates for 65746 — Seymour, Missouri
NOAA 1991–2020 normals from Ava 6NW, MO (1,253 ft), 10 miles south.
Updated
In Seymour, the last spring frost (32°F) is around April 23 in half of years and has passed by May 6 in nine years out of ten. The first fall frost comes around October 17, as early as October 4 one year in ten, leaving a typical freeze-free season of 175 days (NOAA, Ava 6NW, MO).
- Last spring frost
- April 23
- First fall frost
- October 17
- Growing season
- 175 days
- Hardiness zone
- 6b
50% probability
50% probability
freeze-free, 50%
-5 to 0°F (-20.6 to -17.8°C) coldest night
- First snow
- December 25
- Last snow
- February 22
- Winters with snow
- 100%
- Snow per year
- 7.7"
median, 1991–2020
median, 1991–2020
23 of 23 observed
NOAA normal
Frost risk by date in Seymour
Half of springs at Ava 6NW, MO see their last 32°F night by April 23; only one in ten is past it by April 10, and one in ten still has one after May 6. Planting tender crops after April 29 leaves a 30% risk of a frost on them, after May 1 20%, and after May 6 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 94% of the 158 Missouri stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 17 in half of years, as early as October 4 one year in ten, and holds off past October 28 one year in ten. A hard freeze of 28°F follows 7 days later, around October 24; in spring the one-in-ten date for 28°F is April 26, 10 days before the 32°F one. The freeze-free season lasts 175 days in a typical year, shorter than at 95% of the 158 Missouri stations; it reaches 193 days one year in ten and falls short of 157 one year in ten. On average 120 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 9 days longer, to about May 2, and return around October 7. Severe cold of 16°F or below comes every winter, usually between November 25 and March 7.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 20 | Apr 24 | Apr 27 | Apr 30 | May 2 | May 4 | May 7 | May 11 | May 15 |
| 32°F | Apr 10 | Apr 15 | Apr 18 | Apr 20 | Apr 23 | Apr 26 | Apr 29 | May 1 | May 6 |
| 28°F | Mar 30 | Apr 3 | Apr 5 | Apr 9 | Apr 12 | Apr 15 | Apr 18 | Apr 21 | Apr 26 |
| 24°F | Mar 13 | Mar 20 | Mar 25 | Mar 29 | Apr 1 | Apr 3 | Apr 6 | Apr 9 | Apr 15 |
| 20°F | Feb 28 | Mar 6 | Mar 11 | Mar 15 | Mar 19 | Mar 23 | Mar 26 | Mar 30 | Apr 4 |
| 16°F | Feb 17 | Feb 24 | Feb 28 | Mar 3 | Mar 7 | Mar 11 | Mar 15 | Mar 19 | Mar 25 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 26 | Sep 30 | Oct 3 | Oct 5 | Oct 7 | Oct 9 | Oct 12 | Oct 15 | Oct 19 |
| 32°F | Oct 4 | Oct 8 | Oct 12 | Oct 14 | Oct 17 | Oct 19 | Oct 21 | Oct 24 | Oct 28 |
| 28°F | Oct 12 | Oct 17 | Oct 19 | Oct 22 | Oct 24 | Oct 26 | Oct 30 | Nov 1 | Nov 5 |
| 24°F | Oct 20 | Oct 25 | Oct 29 | Nov 1 | Nov 3 | Nov 5 | Nov 8 | Nov 13 | Nov 19 |
| 20°F | Oct 31 | Nov 3 | Nov 6 | Nov 9 | Nov 13 | Nov 16 | Nov 20 | Nov 25 | Dec 1 |
| 16°F | Nov 7 | Nov 13 | Nov 17 | Nov 22 | Nov 25 | Nov 29 | Dec 3 | Dec 8 | Dec 17 |
Freeze probabilities 1991–2020 at Ava 6NW, 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 65746 →Compare Seymour with another place →
Compared with the next station
The nearest other station, Mansfield, MO, 12 miles east of Seymour and 195 feet higher, has a last frost 12 days earlier (April 11), a first frost 9 days later (October 26), a season 22 days longer.
When it snows in Seymour, Missouri
The first measurable snow (0.1 inch or more) in Seymour usually arrives around December 25, and the last of the season around February 22. Those are the middle dates across the winters of 1991–2020 at Mansfield, MO, 12 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 60 days after the last snow.
Planting calendar for 65746
| When | What to do |
|---|---|
| February 12 – February 26 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 26 – March 12 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 26 – April 9 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 23 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 25 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 3 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 17 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 65746 is 10 miles from Ava 6NW, MO, which stands at 1,253 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 65746 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°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.