USDA Hardiness Zone 6b
Frost Dates for 66083 — Spring Hill, Kansas
NOAA 1991–2020 normals from Hillsdale Lake, KS (1,010 ft), 6 miles southwest.
Updated
In Spring Hill, the last spring frost (32°F) is around April 9 in half of years and has passed by April 23 in nine years out of ten. The first fall frost comes around October 31, as early as October 17 one year in ten, leaving a typical freeze-free season of 204 days (NOAA, Hillsdale Lake, KS).
- Last spring frost
- April 9
- First fall frost
- October 31
- Growing season
- 204 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 7
- Last snow
- February 28
- Winters with snow
- 100%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
19 of 19 observed
NOAA normal
Frost risk by date in Spring Hill
Half of springs at Hillsdale Lake, KS see their last 32°F night by April 9; only one in ten is past it by March 27, and one in ten still has one after April 23. Planting tender crops after April 14 leaves a 30% risk of a frost on them, after April 18 20%, and after April 23 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 44% of the 110 Kansas stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 31 in half of years, as early as October 17 one year in ten, and holds off past November 13 one year in ten. A hard freeze of 28°F follows 8 days later, around November 8; in spring the one-in-ten date for 28°F is April 13, 10 days before the 32°F one. The freeze-free season lasts 204 days in a typical year, longer than at 91% of the 110 Kansas stations; it reaches 221 days one year in ten and falls short of 183 one year in ten. On average 110 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 10 days longer, to about April 19, and return around October 21. Severe cold of 16°F or below comes every winter, usually between December 3 and March 4.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 6 | Apr 10 | Apr 13 | Apr 16 | Apr 19 | Apr 22 | Apr 25 | Apr 29 | May 3 |
| 32°F | Mar 27 | Apr 1 | Apr 4 | Apr 6 | Apr 9 | Apr 11 | Apr 14 | Apr 18 | Apr 23 |
| 28°F | Mar 16 | Mar 22 | Mar 26 | Mar 30 | Apr 1 | Apr 3 | Apr 6 | Apr 9 | Apr 13 |
| 24°F | Mar 4 | Mar 10 | Mar 15 | Mar 18 | Mar 22 | Mar 25 | Mar 29 | Apr 1 | Apr 5 |
| 20°F | Feb 25 | Mar 1 | Mar 5 | Mar 9 | Mar 12 | Mar 16 | Mar 19 | Mar 23 | Mar 29 |
| 16°F | Feb 15 | Feb 22 | Feb 26 | Mar 1 | Mar 4 | Mar 8 | Mar 11 | Mar 16 | Mar 21 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 7 | Oct 13 | Oct 17 | Oct 19 | Oct 21 | Oct 23 | Oct 26 | Oct 29 | Nov 1 |
| 32°F | Oct 17 | Oct 22 | Oct 25 | Oct 28 | Oct 31 | Nov 1 | Nov 4 | Nov 8 | Nov 13 |
| 28°F | Oct 27 | Nov 1 | Nov 3 | Nov 5 | Nov 8 | Nov 11 | Nov 14 | Nov 17 | Nov 23 |
| 24°F | Nov 2 | Nov 6 | Nov 10 | Nov 14 | Nov 16 | Nov 19 | Nov 23 | Nov 28 | Dec 2 |
| 20°F | Nov 9 | Nov 15 | Nov 19 | Nov 23 | Nov 26 | Nov 30 | Dec 2 | Dec 5 | Dec 10 |
| 16°F | Nov 17 | Nov 23 | Nov 27 | Dec 1 | Dec 3 | Dec 6 | Dec 10 | Dec 15 | Dec 21 |
Freeze probabilities 1991–2020 at Hillsdale Lake, 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 66083 →Compare Spring Hill with another place →
Compared with the next station
The nearest other station, Olathe Johnson Co Airport, KS, 7 miles northwest of Spring Hill, has a last frost 4 days later (April 13), a first frost 7 days earlier (October 24), a season 11 days shorter.
When it snows in Spring Hill, Kansas
The first measurable snow (0.1 inch or more) in Spring Hill usually arrives around December 7, and the last of the season around February 28. Those are the middle dates across the winters of 1991–2020 at Paola, KS, 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 40 days after the last snow.
Planting calendar for 66083
| When | What to do |
|---|---|
| January 29 – February 12 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 12 – February 26 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 12 – March 26 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 9 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 8 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 17 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 31 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 66083 is 6 miles from Hillsdale Lake, KS, which stands at 1,010 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 66083 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.