USDA Hardiness Zone 8a
Frost Dates for 74764 — Valliant, Oklahoma
NOAA 1991–2020 normals from Idabel, OK (365 ft), 16 miles southeast.
Updated
In Valliant, the last spring frost (32°F) is around March 31 in half of years and has passed by April 18 in nine years out of ten. The first fall frost comes around November 3, as early as October 18 one year in ten, leaving a typical freeze-free season of 221 days (NOAA, Idabel, OK).
- Last spring frost
- March 31
- First fall frost
- November 3
- Growing season
- 221 days
- Hardiness zone
- 8a
50% probability
50% probability
freeze-free, 50%
10 to 15°F (-12.2 to -9.4°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 45%
- Snow per year
- 1.2"
median, 1991–2020
median, 1991–2020
9 of 20 observed
NOAA normal
Frost risk by date in Valliant
Half of springs at Idabel, OK see their last 32°F night by March 31; only one in ten is past it by March 9, and one in ten still has one after April 18. Planting tender crops after April 6 leaves a 30% risk of a frost on them, after April 11 20%, and after April 18 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 60% of the 114 Oklahoma stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 3 in half of years, as early as October 18 one year in ten, and holds off past November 20 one year in ten. A hard freeze of 28°F follows 10 days later, around November 13; in spring the one-in-ten date for 28°F is April 2, 16 days before the 32°F one. The freeze-free season lasts 221 days in a typical year, longer than at 80% of the 114 Oklahoma stations; it reaches 245 days one year in ten and falls short of 196 one year in ten. On average 71 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 12 days longer, to about April 12, and return around October 24. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 88%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 26 | Apr 1 | Apr 5 | Apr 8 | Apr 12 | Apr 15 | Apr 19 | Apr 24 | Apr 28 |
| 32°F | Mar 9 | Mar 16 | Mar 21 | Mar 26 | Mar 31 | Apr 3 | Apr 6 | Apr 11 | Apr 18 |
| 28°F | Feb 23 | Feb 28 | Mar 4 | Mar 8 | Mar 13 | Mar 17 | Mar 22 | Mar 28 | Apr 2 |
| 24°F | Jan 31 | Feb 11 | Feb 19 | Feb 23 | Feb 28 | Mar 2 | Mar 7 | Mar 12 | Mar 19 |
| 20°F99% of yrs | Jan 16 | Jan 25 | Jan 31 | Feb 6 | Feb 13 | Feb 18 | Feb 24 | Mar 1 | Mar 9 |
| 16°F88% of yrs | Dec 28 | Jan 8 | Jan 17 | Jan 23 | Jan 29 | Feb 2 | Feb 8 | Feb 13 | Feb 24 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 12 | Oct 16 | Oct 19 | Oct 22 | Oct 24 | Oct 27 | Oct 30 | Nov 2 | Nov 6 |
| 32°F | Oct 18 | Oct 24 | Oct 29 | Nov 1 | Nov 3 | Nov 5 | Nov 9 | Nov 14 | Nov 20 |
| 28°F | Oct 29 | Nov 2 | Nov 5 | Nov 9 | Nov 13 | Nov 17 | Nov 21 | Nov 27 | Dec 1 |
| 24°F | Nov 7 | Nov 12 | Nov 17 | Nov 22 | Nov 27 | Dec 1 | Dec 4 | Dec 9 | Dec 17 |
| 20°F99% of yrs | Nov 19 | Nov 26 | Dec 1 | Dec 6 | Dec 12 | Dec 20 | Dec 26 | Jan 2 | Jan 10 |
| 16°F88% of yrs | Dec 1 | Dec 7 | Dec 16 | Dec 25 | Jan 1 | Jan 4 | Jan 10 | Jan 16 | Jan 30 |
Freeze probabilities 1991–2020 at Idabel, 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 74764 →Compare Valliant with another place →
Weather by month in Valliant
July is the warmest month at Idabel, OK, averaging 94°F by day and 70°F at night; January is the coldest at 54°F and 29°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 47% of years.
Warmth for growing adds up to 5,376 growing degree days a year (base 50°F), more than at 83% of the 114 Oklahoma stations. 39% of them (2,091) have built up by the end of June, and July adds the most, 986. Precipitation totals 54.6 inches a year, most in May (6.4") and least in August (3.0"); May to September bring 39% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 54 | 29 | 3.8 | 100% | 21 | 31 |
| Feb | 59 | 34 | 4.1 | 100% | 14 | 61 |
| Mar | 67 | 41 | 5.0 | 94% | 7 | 191 |
| Apr | 75 | 48 | 5.4 | 47% | 1 | 353 |
| May | 82 | 59 | 6.4 | 1% | <1 | 628 |
| Jun | 89 | 66 | 4.1 | 0% | 0 | 826 |
| Jul | 94 | 70 | 3.6 | 0% | 0 | 986 |
| Aug | 94 | 69 | 3.0 | 0% | 0 | 969 |
| Sep | 87 | 61 | 4.3 | 0% | 0 | 727 |
| Oct | 77 | 49 | 5.2 | 39% | 1 | 411 |
| Nov | 65 | 39 | 4.7 | 97% | 9 | 144 |
| Dec | 57 | 32 | 5.0 | 100% | 17 | 49 |
Monthly normals 1991–2020 at Idabel, OK (365 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, Broken Bow 1 N, OK, 19 miles east of Valliant, has a last frost 1 day later (April 1), a first frost 1 day earlier (November 2), a season 1 day shorter.
When it snows in Valliant, Oklahoma
Measurable snow is rare here: only 9 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Valliant 3 W, OK, 4.7 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 74764
| When | What to do |
|---|---|
| January 20 – February 3 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 3 – February 17 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 3 – March 17 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 31 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 11 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 20 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 3 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 74764 is 16 miles from Idabel, OK, which stands at 365 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 74745 (Idabel). The 2023 USDA Plant Hardiness Zone Map lists ZIP 74764 in zone 8a, the band where the coldest night of the year averaged 10 to 15°F (-12.2 to -9.4°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.