USDA Hardiness Zone 6b
Frost Dates for 65233 — Boonville, Missouri
NOAA 1991–2020 normals from Boonville, MO (752 ft), 2 miles north.
Updated
In Boonville, the last spring frost (32°F) is around April 12 in half of years and has passed by April 27 in nine years out of ten. The first fall frost comes around October 25, as early as October 12 one year in ten, leaving a typical freeze-free season of 195 days (NOAA, Boonville, MO).
- Last spring frost
- April 12
- First fall frost
- October 25
- Growing season
- 195 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 10
- Last snow
- February 26
- Winters with snow
- 100%
- Snow per year
- 13.3"
median, 1991–2020
median, 1991–2020
17 of 17 observed
NOAA normal
Frost risk by date in Boonville
Half of springs at Boonville, MO see their last 32°F night by April 12; only one in ten is past it by March 29, and one in ten still has one after April 27. Planting tender crops after April 19 leaves a 30% risk of a frost on them, after April 23 20%, and after April 27 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 54% of the 158 Missouri stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 25 in half of years, as early as October 12 one year in ten, and holds off past November 5 one year in ten. A hard freeze of 28°F follows 10 days later, around November 4; in spring the one-in-ten date for 28°F is April 17, 10 days before the 32°F one. The freeze-free season lasts 195 days in a typical year, longer than at 51% of the 158 Missouri stations; it reaches 215 days one year in ten and falls short of 174 one year in ten. On average 107 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 13 days longer, to about April 25, and return around October 15. Severe cold of 16°F or below comes every winter, usually between December 4 and March 2.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 9 | Apr 14 | Apr 18 | Apr 22 | Apr 25 | Apr 28 | Apr 30 | May 3 | May 7 |
| 32°F | Mar 29 | Apr 2 | Apr 5 | Apr 9 | Apr 12 | Apr 15 | Apr 19 | Apr 23 | Apr 27 |
| 28°F | Mar 16 | Mar 22 | Mar 26 | Mar 29 | Apr 1 | Apr 3 | Apr 7 | Apr 11 | Apr 17 |
| 24°F | Mar 2 | Mar 8 | Mar 12 | Mar 17 | Mar 20 | Mar 23 | Mar 27 | Mar 31 | Apr 5 |
| 20°F | Feb 22 | Feb 28 | Mar 3 | Mar 6 | Mar 9 | Mar 13 | Mar 17 | Mar 21 | Mar 29 |
| 16°F | Feb 12 | Feb 21 | Feb 26 | Feb 28 | Mar 2 | Mar 5 | Mar 9 | Mar 12 | Mar 18 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 30 | Oct 5 | Oct 8 | Oct 12 | Oct 15 | Oct 17 | Oct 20 | Oct 23 | Oct 27 |
| 32°F | Oct 12 | Oct 17 | Oct 20 | Oct 22 | Oct 25 | Oct 28 | Oct 30 | Nov 1 | Nov 5 |
| 28°F | Oct 22 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 13 | Nov 17 |
| 24°F | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 14 | Nov 16 | Nov 20 | Nov 24 | Dec 1 |
| 20°F | Nov 7 | Nov 12 | Nov 16 | Nov 19 | Nov 24 | Nov 28 | Dec 1 | Dec 6 | Dec 13 |
| 16°F | Nov 15 | Nov 22 | Nov 27 | Dec 1 | Dec 4 | Dec 8 | Dec 12 | Dec 18 | Dec 23 |
Freeze probabilities 1991–2020 at Boonville, 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 65233 →Compare Boonville with another place →
Compared with the next station
The nearest other station, New Franklin 1W, MO, 6 miles north of Boonville, has a last frost 1 day later (April 13), a first frost 3 days earlier (October 22), a season 4 days shorter.
When it snows in Boonville, Missouri
The first measurable snow (0.1 inch or more) in Boonville usually arrives around December 10, and the last of the season around February 26. Those are the middle dates across the winters of 1991–2020 at Boonville, MO, 2.7 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 45 days after the last snow.
Planting calendar for 65233
| When | What to do |
|---|---|
| February 1 – February 15 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 15 – March 1 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 15 – March 29 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 12 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 2 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 11 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 25 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 65233 is 2 miles from Boonville, MO, which stands at 752 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 65233 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.