USDA Hardiness Zone 7b
Frost Dates for 74454 — Porter, Oklahoma
NOAA 1991–2020 normals from Wagoner, OK (590 ft), 11 miles northeast.
Updated
In Porter, the last spring frost (32°F) is around March 29 in half of years and has passed by April 14 in nine years out of ten. The first fall frost comes around November 5, as early as October 21 one year in ten, leaving a typical freeze-free season of 223 days (NOAA, Wagoner, OK).
- Last spring frost
- March 29
- First fall frost
- November 5
- Growing season
- 223 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
- December 23
- Last snow
- February 3
- Winters with snow
- 88%
- Snow per year
- 2.6"
median, 1991–2020
median, 1991–2020
14 of 16 observed
NOAA normal
Frost risk by date in Porter
Half of springs at Wagoner, OK see their last 32°F night by March 29; only one in ten is past it by March 10, and one in ten still has one after April 14. Planting tender crops after April 4 leaves a 30% risk of a frost on them, after April 8 20%, and after April 14 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 61% of the 114 Oklahoma stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 5 in half of years, as early as October 21 one year in ten, and holds off past November 22 one year in ten. A hard freeze of 28°F follows 11 days later, around November 16; in spring the one-in-ten date for 28°F is April 3, 11 days before the 32°F one. The freeze-free season lasts 223 days in a typical year, longer than at 85% of the 114 Oklahoma stations; it reaches 247 days one year in ten and falls short of 200 one year in ten. On average 69 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 10, and return around October 27. Severe cold of 16°F or below comes in 97% of winters, usually between December 24 and February 7.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 25 | Mar 31 | Apr 3 | Apr 6 | Apr 10 | Apr 13 | Apr 17 | Apr 21 | Apr 25 |
| 32°F | Mar 10 | Mar 16 | Mar 20 | Mar 25 | Mar 29 | Apr 1 | Apr 4 | Apr 8 | Apr 14 |
| 28°F | Feb 25 | Mar 2 | Mar 6 | Mar 11 | Mar 15 | Mar 19 | Mar 23 | Mar 28 | Apr 3 |
| 24°F | Feb 10 | Feb 19 | Feb 24 | Feb 28 | Mar 3 | Mar 7 | Mar 11 | Mar 15 | Mar 22 |
| 20°F | Jan 28 | Feb 4 | Feb 11 | Feb 17 | Feb 21 | Feb 26 | Mar 2 | Mar 6 | Mar 13 |
| 16°F97% of yrs | Jan 8 | Jan 20 | Jan 27 | Feb 1 | Feb 7 | Feb 13 | Feb 20 | Feb 28 | Mar 6 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 12 | Oct 18 | Oct 22 | Oct 25 | Oct 27 | Oct 30 | Nov 1 | Nov 5 | Nov 10 |
| 32°F | Oct 21 | Oct 28 | Oct 31 | Nov 3 | Nov 5 | Nov 8 | Nov 12 | Nov 16 | Nov 22 |
| 28°F | Oct 31 | Nov 4 | Nov 8 | Nov 12 | Nov 16 | Nov 21 | Nov 26 | Nov 30 | Dec 4 |
| 24°F | Nov 7 | Nov 13 | Nov 18 | Nov 24 | Nov 28 | Dec 1 | Dec 4 | Dec 9 | Dec 16 |
| 20°F | Nov 19 | Nov 26 | Nov 30 | Dec 4 | Dec 9 | Dec 14 | Dec 19 | Dec 24 | Jan 1 |
| 16°F97% of yrs | Nov 29 | Dec 7 | Dec 14 | Dec 19 | Dec 24 | Dec 30 | Jan 3 | Jan 10 | Jan 19 |
Freeze probabilities 1991–2020 at Wagoner, 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 74454 →Compare Porter with another place →
Weather by month in Porter
July is the warmest month at Wagoner, OK, averaging 92°F by day and 73°F at night; January is the coldest at 49°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 40% of years.
Warmth for growing adds up to 5,279 growing degree days a year (base 50°F), more than at 70% of the 114 Oklahoma stations. 38% of them (2,022) have built up by the end of June, and July adds the most, 999.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 49 | 29 | 100% | 21 | 18 |
| Feb | 55 | 33 | 100% | 13 | 43 |
| Mar | 64 | 41 | 95% | 9 | 169 |
| Apr | 73 | 50 | 40% | 1 | 353 |
| May | 80 | 60 | 0% | 0 | 615 |
| Jun | 87 | 68 | 0% | 0 | 825 |
| Jul | 92 | 73 | 0% | 0 | 999 |
| Aug | 93 | 71 | 0% | 0 | 982 |
| Sep | 84 | 63 | 0% | 0 | 714 |
| Oct | 73 | 51 | 31% | 1 | 389 |
| Nov | 62 | 40 | 97% | 8 | 138 |
| Dec | 52 | 32 | 100% | 17 | 35 |
Monthly normals 1991–2020 at Wagoner, OK (590 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, 12 miles southeast of Porter, has a last frost 9 days later (April 7), a first frost 6 days earlier (October 30), a season 15 days shorter.
When it snows in Porter, Oklahoma
The first measurable snow (0.1 inch or more) in Porter usually arrives around December 23, and the last of the season around February 3. Those are the middle dates across the winters of 1991–2020 at Muskogee, OK, 12.4 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 54 days after the last snow.
Planting calendar for 74454
| When | What to do |
|---|---|
| January 18 – February 1 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 1 – February 15 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 1 – March 15 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 29 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 13 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 22 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 5 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 74454 is 11 miles from Wagoner, OK, which stands at 590 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 74467 (Wagoner). The 2023 USDA Plant Hardiness Zone Map lists ZIP 74454 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.