USDA Hardiness Zone 6b
Frost Dates for 63068 — New Haven, Missouri
NOAA 1991–2020 normals from Rosebud, MO (730 ft), 10 miles southwest.
Updated
In New Haven, the last spring frost (32°F) is around April 27 in half of years and has passed by May 12 in nine years out of ten. The first fall frost comes around October 13, as early as September 29 one year in ten, leaving a typical freeze-free season of 168 days (NOAA, Rosebud, MO).
- Last spring frost
- April 27
- First fall frost
- October 13
- Growing season
- 168 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 2
- Last snow
- March 8
- Winters with snow
- 100%
- Snow per year
- 14.2"
median, 1991–2020
median, 1991–2020
22 of 22 observed
NOAA normal
Frost risk by date in New Haven
Half of springs at Rosebud, MO see their last 32°F night by April 27; only one in ten is past it by April 11, and one in ten still has one after May 12. Planting tender crops after May 3 leaves a 30% risk of a frost on them, after May 7 20%, and after May 12 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 13 in half of years, as early as September 29 one year in ten, and holds off past October 26 one year in ten. A hard freeze of 28°F follows 11 days later, around October 24; in spring the one-in-ten date for 28°F is May 5, 7 days before the 32°F one. The freeze-free season lasts 168 days in a typical year, shorter than at 99% of the 158 Missouri stations; it reaches 189 days one year in ten and falls short of 146 one year in ten. On average 124 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 6, and return around October 2. Severe cold of 16°F or below comes every winter, usually between November 24 and March 9.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 23 | Apr 28 | May 1 | May 4 | May 6 | May 9 | May 12 | May 15 | May 21 |
| 32°F | Apr 11 | Apr 16 | Apr 20 | Apr 24 | Apr 27 | Apr 30 | May 3 | May 7 | May 12 |
| 28°F | Mar 28 | Apr 3 | Apr 7 | Apr 11 | Apr 14 | Apr 18 | Apr 22 | Apr 27 | May 5 |
| 24°F | Mar 14 | Mar 21 | Mar 27 | Mar 31 | Apr 3 | Apr 5 | Apr 9 | Apr 14 | Apr 21 |
| 20°F | Mar 3 | Mar 9 | Mar 13 | Mar 17 | Mar 21 | Mar 24 | Mar 29 | Apr 1 | Apr 7 |
| 16°F | Feb 21 | Feb 27 | Mar 2 | Mar 5 | Mar 9 | Mar 12 | Mar 16 | Mar 20 | Mar 27 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 18 | Sep 23 | Sep 26 | Sep 30 | Oct 2 | Oct 5 | Oct 8 | Oct 11 | Oct 16 |
| 32°F | Sep 29 | Oct 3 | Oct 7 | Oct 10 | Oct 13 | Oct 15 | Oct 18 | Oct 21 | Oct 26 |
| 28°F | Oct 9 | Oct 14 | Oct 18 | Oct 21 | Oct 24 | Oct 26 | Oct 29 | Nov 1 | Nov 5 |
| 24°F | Oct 19 | Oct 25 | Oct 29 | Nov 1 | Nov 3 | Nov 5 | Nov 8 | Nov 12 | Nov 18 |
| 20°F | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 13 | Nov 16 | Nov 20 | Nov 25 | Dec 1 |
| 16°F | Nov 7 | Nov 12 | Nov 16 | Nov 20 | Nov 24 | Nov 29 | Dec 1 | Dec 6 | Dec 11 |
Freeze probabilities 1991–2020 at Rosebud, 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 63068 →Compare New Haven with another place →
Weather by month in New Haven
July is the warmest month at Rosebud, MO, averaging 87°F by day and 64°F at night; January is the coldest at 40°F and 18°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 38% of years.
Warmth for growing adds up to 3,539 growing degree days a year (base 50°F), fewer than at 92% of the 158 Missouri stations. 36% of them (1,271) have built up by the end of June, and July adds the most, 789. Precipitation totals 45.2 inches a year, most in May (5.6") and least in February (2.4"); May to September bring 48% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 40 | 18 | 2.7 | 100% | 27 | 4 |
| Feb | 45 | 21 | 2.4 | 100% | 24 | 12 |
| Mar | 55 | 30 | 3.7 | 100% | 18 | 58 |
| Apr | 66 | 40 | 4.8 | 98% | 7 | 171 |
| May | 75 | 50 | 5.6 | 38% | 1 | 392 |
| Jun | 83 | 60 | 4.5 | 0% | 0 | 634 |
| Jul | 87 | 64 | 3.9 | 0% | 0 | 789 |
| Aug | 87 | 61 | 3.9 | 0% | 0 | 742 |
| Sep | 79 | 52 | 4.0 | 14% | <1 | 477 |
| Oct | 68 | 41 | 3.4 | 97% | 5 | 203 |
| Nov | 55 | 31 | 3.6 | 100% | 17 | 49 |
| Dec | 44 | 22 | 2.7 | 100% | 26 | 8 |
Monthly normals 1991–2020 at Rosebud, MO (730 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, Washington, MO, 15 miles east of New Haven and 243 feet lower, has a last frost 19 days earlier (April 8), a first frost 12 days later (October 25), a season 31 days longer.
When it snows in New Haven, Missouri
The first measurable snow (0.1 inch or more) in New Haven usually arrives around December 2, and the last of the season around March 8. Those are the middle dates across the winters of 1991–2020 at Rosebud, MO, 10.3 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 50 days after the last snow.
Planting calendar for 63068
| When | What to do |
|---|---|
| February 16 – March 2 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 2 – March 16 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 30 – April 13 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 27 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 21 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 29 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 13 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 63068 is 10 miles from Rosebud, MO, which stands at 730 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 63068 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.