USDA Hardiness Zone 7b
Frost Dates for 73015 — Carnegie, Oklahoma
NOAA 1991–2020 normals from Carnegie 5 NE, OK (1,481 ft), 4 miles north.
Updated
In Carnegie, the last spring frost (32°F) is around April 6 in half of years and has passed by April 22 in nine years out of ten. The first fall frost comes around October 31, as early as October 15 one year in ten, leaving a typical freeze-free season of 206 days (NOAA, Carnegie 5 NE, OK).
- Last spring frost
- April 6
- First fall frost
- October 31
- Growing season
- 206 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 30
- Last snow
- February 7
- Winters with snow
- 100%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
15 of 15 observed
NOAA normal
Frost risk by date in Carnegie
Half of springs at Carnegie 5 NE, 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 22. Planting tender crops after April 12 leaves a 30% risk of a frost on them, after April 18 20%, and after April 22 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 October 31 in half of years, as early as October 15 one year in ten, and holds off past November 14 one year in ten. A hard freeze of 28°F follows 9 days later, around November 9; in spring the one-in-ten date for 28°F is April 11, 11 days before the 32°F one. The freeze-free season lasts 206 days in a typical year, shorter than at 71% of the 114 Oklahoma stations; it reaches 230 days one year in ten and falls short of 183 one year in ten. On average 80 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 16, and return around October 23. Severe cold of 16°F or below comes in 98% of winters, usually between December 15 and February 15.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 2 | Apr 6 | Apr 10 | Apr 13 | Apr 16 | Apr 19 | Apr 22 | Apr 26 | Apr 30 |
| 32°F | Mar 20 | Mar 26 | Mar 31 | Apr 3 | Apr 6 | Apr 9 | Apr 12 | Apr 18 | Apr 22 |
| 28°F | Mar 4 | Mar 11 | Mar 16 | Mar 21 | Mar 25 | Mar 29 | Apr 2 | Apr 6 | Apr 11 |
| 24°F | Feb 22 | Feb 28 | Mar 3 | Mar 6 | Mar 10 | Mar 14 | Mar 18 | Mar 24 | Mar 31 |
| 20°F | Feb 4 | Feb 15 | Feb 20 | Feb 24 | Feb 28 | Mar 2 | Mar 5 | Mar 11 | Mar 16 |
| 16°F98% of yrs | Jan 16 | Jan 28 | Feb 3 | Feb 10 | Feb 15 | Feb 20 | Feb 25 | Mar 1 | Mar 7 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 9 | Oct 15 | Oct 18 | Oct 20 | Oct 23 | Oct 25 | Oct 28 | Oct 31 | Nov 4 |
| 32°F | Oct 15 | Oct 21 | Oct 25 | Oct 28 | Oct 31 | Nov 3 | Nov 5 | Nov 9 | Nov 14 |
| 28°F | Oct 24 | Oct 31 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 15 | Nov 20 | Nov 26 |
| 24°F | Nov 1 | Nov 6 | Nov 11 | Nov 15 | Nov 20 | Nov 24 | Nov 27 | Dec 1 | Dec 7 |
| 20°F | Nov 9 | Nov 18 | Nov 24 | Nov 27 | Dec 1 | Dec 4 | Dec 10 | Dec 15 | Dec 21 |
| 16°F98% of yrs | Nov 23 | Nov 30 | Dec 4 | Dec 10 | Dec 15 | Dec 19 | Dec 25 | Jan 2 | Jan 12 |
Freeze probabilities 1991–2020 at Carnegie 5 NE, 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 73015 →Compare Carnegie with another place →
Weather by month in Carnegie
July is the warmest month at Carnegie 5 NE, OK, averaging 94°F by day and 71°F at night; January is the coldest at 51°F and 26°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 66% of years.
Warmth for growing adds up to 5,148 growing degree days a year (base 50°F), more than at 51% of the 114 Oklahoma stations. 38% of them (1,934) have built up by the end of June, and July adds the most, 1,014.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 51 | 26 | 100% | 24 | 12 |
| Feb | 55 | 29 | 100% | 15 | 28 |
| Mar | 63 | 38 | 99% | 9 | 128 |
| Apr | 72 | 47 | 66% | 2 | 304 |
| May | 81 | 58 | 3% | 0 | 605 |
| Jun | 89 | 68 | 0% | 0 | 858 |
| Jul | 94 | 71 | 0% | 0 | 1014 |
| Aug | 94 | 70 | 0% | 0 | 982 |
| Sep | 86 | 62 | 0% | 0 | 718 |
| Oct | 75 | 49 | 51% | 1 | 373 |
| Nov | 62 | 37 | 99% | 9 | 110 |
| Dec | 51 | 28 | 100% | 20 | 17 |
Monthly normals 1991–2020 at Carnegie 5 NE, OK (1,481 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, Apache 4ENE Mesonet, OK, 22 miles southeast of Carnegie, has a last frost 3 days earlier (April 3), a first frost 3 days later (November 3), a season 7 days longer.
When it snows in Carnegie, Oklahoma
The first measurable snow (0.1 inch or more) in Carnegie usually arrives around December 30, and the last of the season around February 7. Those are the middle dates across the winters of 1991–2020 at Carnegie 5 NE, OK, 4.3 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 58 days after the last snow.
Planting calendar for 73015
| 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 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 73015 is 4 miles from Carnegie 5 NE, OK, which stands at 1,481 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 73015 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.