USDA Hardiness Zone 7b
Frost Dates for 74451 — Park Hill, Oklahoma
NOAA 1991–2020 normals from Tahlequah, OK (850 ft), 13 miles north.
Updated
In Park Hill, the last spring frost (32°F) is around April 4 in half of years and has passed by April 24 in nine years out of ten. The first fall frost comes around October 31, as early as October 16 one year in ten, leaving a typical freeze-free season of 209 days (NOAA, Tahlequah, OK).
- Last spring frost
- April 4
- First fall frost
- October 31
- Growing season
- 209 days
- Hardiness zone
- 7b
50% probability
50% probability
freeze-free, 50%
5 to 10°F (-15.0 to -12.2°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 47%
- Snow per year
- 1.9"
median, 1991–2020
median, 1991–2020
9 of 19 observed
NOAA normal
Frost risk by date in Park Hill
Half of springs at Tahlequah, OK see their last 32°F night by April 4; only one in ten is past it by March 17, and one in ten still has one after April 24. Planting tender crops after April 11 leaves a 30% risk of a frost on them, after April 16 20%, and after April 24 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 31 in half of years, as early as October 16 one year in ten, and holds off past November 16 one year in ten. A hard freeze of 28°F follows 10 days later, around November 10; in spring the one-in-ten date for 28°F is April 9, 15 days before the 32°F one. The freeze-free season lasts 209 days in a typical year, shorter than at 58% of the 114 Oklahoma stations; it reaches 236 days one year in ten and falls short of 186 one year in ten. On average 74 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 11 days longer, to about April 15, and return around October 23. Severe cold of 16°F or below comes in 99% of winters, usually between December 17 and February 16.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 31 | Apr 4 | Apr 8 | Apr 12 | Apr 15 | Apr 19 | Apr 24 | Apr 29 | May 4 |
| 32°F | Mar 17 | Mar 23 | Mar 28 | Mar 31 | Apr 4 | Apr 7 | Apr 11 | Apr 16 | Apr 24 |
| 28°F | Mar 2 | Mar 9 | Mar 15 | Mar 19 | Mar 23 | Mar 27 | Mar 31 | Apr 3 | Apr 9 |
| 24°F | Feb 19 | Feb 26 | Mar 2 | Mar 6 | Mar 10 | Mar 14 | Mar 18 | Mar 24 | Mar 31 |
| 20°F | Feb 3 | Feb 13 | Feb 19 | Feb 25 | Feb 28 | Mar 4 | Mar 8 | Mar 14 | Mar 20 |
| 16°F99% of yrs | Jan 17 | Jan 27 | Feb 3 | Feb 10 | Feb 16 | Feb 23 | Feb 28 | Mar 6 | Mar 13 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 6 | Oct 12 | Oct 16 | Oct 19 | Oct 23 | Oct 25 | Oct 28 | Oct 31 | Nov 4 |
| 32°F | Oct 16 | Oct 22 | Oct 25 | Oct 29 | Oct 31 | Nov 2 | Nov 6 | Nov 10 | Nov 16 |
| 28°F | Oct 26 | Oct 31 | Nov 3 | Nov 7 | Nov 10 | Nov 14 | Nov 18 | Nov 22 | Nov 28 |
| 24°F | Nov 3 | Nov 8 | Nov 13 | Nov 18 | Nov 21 | Nov 26 | Nov 30 | Dec 4 | Dec 9 |
| 20°F | Nov 12 | Nov 21 | Nov 26 | Nov 30 | Dec 3 | Dec 6 | Dec 10 | Dec 16 | Dec 23 |
| 16°F99% of yrs | Nov 24 | Dec 1 | Dec 6 | Dec 12 | Dec 17 | Dec 21 | Dec 26 | Jan 1 | Jan 9 |
Freeze probabilities 1991–2020 at Tahlequah, 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 74451 →Compare Park Hill with another place →
Weather by month in Park Hill
July is the warmest month at Tahlequah, OK, averaging 93°F by day and 69°F at night; January is the coldest at 51°F and 28°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 59% of years.
Warmth for growing adds up to 5,106 growing degree days a year (base 50°F), fewer than at 57% of the 114 Oklahoma stations. 39% of them (1,969) have built up by the end of June, and July adds the most, 962. Precipitation totals 51.0 inches a year, most in May (6.3") and least in January (2.5"); May to September bring 49% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 51 | 28 | 2.5 | 100% | 21 | 24 |
| Feb | 56 | 32 | 3.0 | 100% | 15 | 45 |
| Mar | 65 | 40 | 4.4 | 97% | 8 | 172 |
| Apr | 74 | 48 | 4.7 | 59% | 1 | 349 |
| May | 80 | 57 | 6.3 | 2% | 0 | 577 |
| Jun | 88 | 65 | 5.5 | 0% | 0 | 804 |
| Jul | 93 | 69 | 4.4 | 0% | 0 | 962 |
| Aug | 92 | 68 | 4.1 | 0% | 0 | 924 |
| Sep | 85 | 61 | 4.9 | 1% | 0 | 691 |
| Oct | 75 | 49 | 4.2 | 50% | 1 | 391 |
| Nov | 63 | 39 | 4.2 | 99% | 9 | 134 |
| Dec | 53 | 31 | 2.8 | 100% | 17 | 34 |
Monthly normals 1991–2020 at Tahlequah, OK (850 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, Muskogee, OK, 21 miles west of Park Hill and 332 feet lower, has a last frost 3 days later (April 7), a first frost 1 day earlier (October 30), a season 1 day shorter.
When it snows in Park Hill, Oklahoma
Measurable snow is rare here: only 9 of 19 winters from 1991 to 2020 recorded 0.1 inch or more at Sallisaw 2 NW, OK, 21.8 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 74451
| When | What to do |
|---|---|
| January 24 – February 7 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 7 – February 21 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 7 – March 21 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 4 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 74451 is 13 miles from Tahlequah, OK, which stands at 850 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 74464 (Tahlequah). The 2023 USDA Plant Hardiness Zone Map lists ZIP 74451 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°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.