USDA Hardiness Zone 7a
Frost Dates for 74363 — Quapaw, Oklahoma
NOAA 1991–2020 normals from Miami, OK (805 ft), 10 miles southwest.
Updated
In Quapaw, the last spring frost (32°F) is around April 6 in half of years and has passed by April 26 in nine years out of ten. The first fall frost comes around October 27, as early as October 14 one year in ten, leaving a typical freeze-free season of 203 days (NOAA, Miami, OK).
- Last spring frost
- April 6
- First fall frost
- October 27
- Growing season
- 203 days
- Hardiness zone
- 7a
50% probability
50% probability
freeze-free, 50%
0 to 5°F (-17.8 to -15.0°C) coldest night
- First snow
- December 8
- Last snow
- February 25
- Winters with snow
- 88%
- Snow per year
- 7.2"
median, 1991–2020
median, 1991–2020
21 of 24 observed
NOAA normal
Frost risk by date in Quapaw
Half of springs at Miami, OK see their last 32°F night by April 6; only one in ten is past it by March 20, and one in ten still has one after April 26. Planting tender crops after April 13 leaves a 30% risk of a frost on them, after April 19 20%, and after April 26 10%. The 20 days between the even-odds date and the one-in-ten date is wider than at 92% of the 114 Oklahoma stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 27 in half of years, as early as October 14 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 9 days later, around November 5; in spring the one-in-ten date for 28°F is April 10, 16 days before the 32°F one. The freeze-free season lasts 203 days in a typical year, shorter than at 81% of the 114 Oklahoma stations; it reaches 227 days one year in ten and falls short of 180 one year in ten. On average 89 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 19, and return around October 19. Severe cold of 16°F or below comes every winter, usually between December 15 and February 18.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 2 | Apr 8 | Apr 11 | Apr 15 | Apr 19 | Apr 23 | Apr 27 | Apr 30 | May 5 |
| 32°F | Mar 20 | Mar 27 | Mar 31 | Apr 3 | Apr 6 | Apr 9 | Apr 13 | Apr 19 | Apr 26 |
| 28°F | Mar 3 | Mar 10 | Mar 16 | Mar 20 | Mar 25 | Mar 29 | Apr 1 | Apr 5 | Apr 10 |
| 24°F | Feb 22 | Feb 28 | Mar 3 | Mar 7 | Mar 11 | Mar 15 | Mar 18 | Mar 23 | Mar 31 |
| 20°F | Feb 7 | Feb 15 | Feb 21 | Feb 25 | Feb 28 | Mar 3 | Mar 7 | Mar 12 | Mar 17 |
| 16°F | Jan 26 | Feb 1 | Feb 7 | Feb 14 | Feb 18 | Feb 23 | Feb 28 | Mar 4 | Mar 10 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 3 | Oct 9 | Oct 13 | Oct 17 | Oct 19 | Oct 22 | Oct 24 | Oct 27 | Oct 31 |
| 32°F | Oct 14 | Oct 19 | Oct 22 | Oct 25 | Oct 27 | Oct 30 | Nov 1 | Nov 5 | Nov 10 |
| 28°F | Oct 21 | Oct 26 | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 12 | Nov 17 | Nov 24 |
| 24°F | Oct 28 | Nov 4 | Nov 8 | Nov 12 | Nov 16 | Nov 20 | Nov 26 | Dec 1 | Dec 6 |
| 20°F | Nov 8 | Nov 15 | Nov 20 | Nov 27 | Dec 1 | Dec 4 | Dec 8 | Dec 14 | Dec 21 |
| 16°F | Nov 23 | Dec 1 | Dec 5 | Dec 11 | Dec 15 | Dec 20 | Dec 24 | Dec 29 | Jan 7 |
Freeze probabilities 1991–2020 at Miami, OK, 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 74363 →Compare Quapaw with another place →
Weather by month in Quapaw
July is the warmest month at Miami, OK, averaging 91°F by day and 70°F at night; January is the coldest at 47°F and 24°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 67% of years.
Warmth for growing adds up to 4,661 growing degree days a year (base 50°F), fewer than at 93% of the 114 Oklahoma stations. 37% of them (1,740) have built up by the end of June, and July adds the most, 941.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 47 | 24 | 100% | 24 | 9 |
| Feb | 52 | 29 | 100% | 19 | 29 |
| Mar | 62 | 37 | 97% | 10 | 122 |
| Apr | 71 | 46 | 67% | 2 | 275 |
| May | 79 | 55 | 4% | 0 | 520 |
| Jun | 87 | 66 | 0% | 0 | 786 |
| Jul | 91 | 70 | 0% | 0 | 941 |
| Aug | 92 | 68 | 0% | 0 | 919 |
| Sep | 83 | 59 | 1% | 0 | 640 |
| Oct | 71 | 47 | 66% | 2 | 304 |
| Nov | 60 | 37 | 100% | 12 | 96 |
| Dec | 50 | 28 | 100% | 20 | 21 |
Monthly normals 1991–2020 at Miami, OK (805 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, Columbus, KS, 17 miles north of Quapaw, has a last frost 1 day earlier (April 5), a first frost 4 days later (October 31), a season 5 days longer.
When it snows in Quapaw, Oklahoma
The first measurable snow (0.1 inch or more) in Quapaw usually arrives around December 8, and the last of the season around February 25. Those are the middle dates across the winters of 1991–2020 at Columbus, KS, 17 miles away: half of years saw snow earlier, half later. Snow fell in 88% of those winters. The last 32°F night of spring typically comes 40 days after the last snow.
Planting calendar for 74363
| When | What to do |
|---|---|
| January 26 – February 9 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 9 – February 23 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 9 – March 23 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 6 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 4 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 13 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 27 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 74363 is 10 miles from Miami, OK, which stands at 805 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 74354 (Miami). The 2023 USDA Plant Hardiness Zone Map lists ZIP 74363 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°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.