USDA Hardiness Zone 6a
Frost Dates for 66935 — Belleville, Kansas
NOAA 1991–2020 normals from Belleville, KS (1,530 ft), under a mile southwest.
Updated
In Belleville, the last spring frost (32°F) is around April 22 in half of years and has passed by May 5 in nine years out of ten. The first fall frost comes around October 17, as early as September 30 one year in ten, leaving a typical freeze-free season of 175 days (NOAA, Belleville, KS).
- Last spring frost
- April 22
- First fall frost
- October 17
- Growing season
- 175 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 7
- Last snow
- March 13
- Winters with snow
- 100%
- Snow per year
- 15.3"
median, 1991–2020
median, 1991–2020
28 of 28 observed
NOAA normal
Frost risk by date in Belleville
Half of springs at Belleville, KS see their last 32°F night by April 22; only one in ten is past it by April 8, and one in ten still has one after May 5. Planting tender crops after April 28 leaves a 30% risk of a frost on them, after May 1 20%, and after May 5 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 65% of the 110 Kansas 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 September 30 one year in ten, and holds off past October 29 one year in ten. A hard freeze of 28°F follows 9 days later, around October 26; in spring the one-in-ten date for 28°F is April 27, 8 days before the 32°F one. The freeze-free season lasts 175 days in a typical year, shorter than at 81% of the 110 Kansas stations; it reaches 193 days one year in ten and falls short of 154 one year in ten. On average 133 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 8 days longer, to about April 30, and return around October 7. Severe cold of 16°F or below comes every winter, usually between November 19 and March 13.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 19 | Apr 23 | Apr 26 | Apr 29 | Apr 30 | May 2 | May 5 | May 8 | May 12 |
| 32°F | Apr 8 | Apr 13 | Apr 17 | Apr 20 | Apr 22 | Apr 25 | Apr 28 | May 1 | May 5 |
| 28°F | Mar 28 | Apr 3 | Apr 6 | Apr 9 | Apr 12 | Apr 16 | Apr 19 | Apr 22 | Apr 27 |
| 24°F | Mar 16 | Mar 23 | Mar 27 | Mar 31 | Apr 2 | Apr 5 | Apr 8 | Apr 13 | Apr 19 |
| 20°F | Mar 7 | Mar 13 | Mar 16 | Mar 20 | Mar 24 | Mar 28 | Mar 31 | Apr 4 | Apr 10 |
| 16°F | Feb 27 | Mar 3 | Mar 7 | Mar 10 | Mar 13 | Mar 17 | Mar 21 | Mar 26 | Apr 1 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 24 | Sep 30 | Oct 2 | Oct 5 | Oct 7 | Oct 10 | Oct 13 | Oct 16 | Oct 20 |
| 32°F | Sep 30 | Oct 5 | Oct 10 | Oct 14 | Oct 17 | Oct 19 | Oct 21 | Oct 24 | Oct 29 |
| 28°F | Oct 10 | Oct 17 | Oct 20 | Oct 23 | Oct 26 | Oct 28 | Nov 1 | Nov 3 | Nov 7 |
| 24°F | Oct 21 | Oct 25 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 8 | Nov 11 | Nov 16 |
| 20°F | Oct 28 | Nov 2 | Nov 5 | Nov 8 | Nov 11 | Nov 13 | Nov 16 | Nov 21 | Nov 27 |
| 16°F | Nov 4 | Nov 9 | Nov 12 | Nov 16 | Nov 19 | Nov 23 | Nov 26 | Dec 1 | Dec 7 |
Freeze probabilities 1991–2020 at Belleville, KS, 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 66935 →Compare Belleville with another place →
Weather by month in Belleville
July is the warmest month at Belleville, KS, averaging 90°F by day and 67°F at night; January is the coldest at 38°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 August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 21% of years.
Warmth for growing adds up to 3,760 growing degree days a year (base 50°F), fewer than at 88% of the 110 Kansas stations. 35% of them (1,310) have built up by the end of June, and July adds the most, 882. Precipitation totals 30.7 inches a year, most in May (4.6") and least in January (0.6"); May to September bring 66% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 38 | 16 | 0.6 | 100% | 30 | 0 |
| Feb | 42 | 19 | 1.0 | 100% | 25 | 5 |
| Mar | 54 | 29 | 1.5 | 100% | 19 | 46 |
| Apr | 64 | 39 | 2.8 | 98% | 6 | 145 |
| May | 74 | 51 | 4.6 | 21% | <1 | 404 |
| Jun | 85 | 62 | 4.3 | 0% | 0 | 709 |
| Jul | 90 | 67 | 4.5 | 0% | 0 | 882 |
| Aug | 88 | 64 | 3.7 | 0% | 0 | 801 |
| Sep | 80 | 55 | 3.1 | 11% | <1 | 531 |
| Oct | 67 | 42 | 2.5 | 93% | 5 | 203 |
| Nov | 53 | 29 | 1.2 | 100% | 18 | 31 |
| Dec | 40 | 19 | 0.9 | 100% | 29 | 1 |
Monthly normals 1991–2020 at Belleville, KS (1,530 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, Concordia Municipal Airport, KS, 19 miles south of Belleville, has a last frost 4 days earlier (April 18), a first frost 2 days later (October 19), a season 8 days longer.
When it snows in Belleville, Kansas
The first measurable snow (0.1 inch or more) in Belleville usually arrives around December 7, and the last of the season around March 13. Those are the middle dates across the winters of 1991–2020 at Belleville, KS, 0.6 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 40 days after the last snow.
Planting calendar for 66935
| When | What to do |
|---|---|
| February 11 – February 25 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 25 – March 11 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 25 – April 8 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 22 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 66935 is under a mile from Belleville, KS, which stands at 1,530 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 66935 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.