USDA Hardiness Zone 7b
Frost Dates for 73651 — Hobart, Oklahoma
NOAA 1991–2020 normals from Hobart 4SE Mesonet, OK (1,568 ft), 3 miles southeast.
Updated
In Hobart, the last spring frost (32°F) is around April 7 in half of years and has passed by April 22 in nine years out of ten. The first fall frost comes around November 4, as early as October 21 one year in ten, leaving a typical freeze-free season of 209 days (NOAA, Hobart 4SE Mesonet, OK).
- Last spring frost
- April 7
- First fall frost
- November 4
- 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
- December 24
- Last snow
- February 8
- Winters with snow
- 86%
- Snow per year
- 5"
median, 1991–2020
median, 1991–2020
18 of 21 observed
NOAA normal
Frost risk by date in Hobart
Half of springs at Hobart 4SE Mesonet, OK see their last 32°F night by April 7; only one in ten is past it by March 19, and one in ten still has one after April 22. Planting tender crops after April 14 leaves a 30% risk of a frost on them, after April 17 20%, and after April 22 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 86% of the 114 Oklahoma stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 4 in half of years, as early as October 21 one year in ten, and holds off past November 16 one year in ten. A hard freeze of 28°F follows 7 days later, around November 11; in spring the one-in-ten date for 28°F is April 12, 10 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 232 days one year in ten and falls short of 187 one year in ten. On average 87 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 17, and return around October 26. Severe cold of 16°F or below comes in 98% of winters, usually between December 16 and February 12.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 2 | Apr 8 | Apr 11 | Apr 14 | Apr 17 | Apr 20 | Apr 22 | Apr 26 | May 1 |
| 32°F | Mar 19 | Mar 25 | Mar 31 | Apr 4 | Apr 7 | Apr 11 | Apr 14 | Apr 17 | Apr 22 |
| 28°F | Mar 2 | Mar 9 | Mar 14 | Mar 19 | Mar 24 | Mar 28 | Apr 2 | Apr 6 | Apr 12 |
| 24°F | Feb 18 | Feb 25 | Mar 1 | Mar 5 | Mar 9 | Mar 13 | Mar 17 | Mar 24 | Mar 31 |
| 20°F | Jan 29 | Feb 9 | Feb 17 | Feb 22 | Feb 26 | Mar 2 | Mar 5 | Mar 10 | Mar 17 |
| 16°F98% of yrs | Jan 5 | Jan 21 | Jan 29 | Feb 5 | Feb 12 | Feb 18 | Feb 24 | Mar 1 | Mar 7 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 14 | Oct 18 | Oct 21 | Oct 24 | Oct 26 | Oct 28 | Nov 1 | Nov 4 | Nov 8 |
| 32°F | Oct 21 | Oct 26 | Oct 29 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 12 | Nov 16 |
| 28°F | Oct 27 | Nov 1 | Nov 5 | Nov 8 | Nov 11 | Nov 14 | Nov 18 | Nov 22 | Nov 28 |
| 24°F | Nov 3 | Nov 9 | Nov 14 | Nov 17 | Nov 21 | Nov 24 | Nov 28 | Dec 2 | Dec 8 |
| 20°F | Nov 13 | Nov 20 | Nov 25 | Nov 29 | Dec 3 | Dec 7 | Dec 11 | Dec 17 | Dec 25 |
| 16°F98% of yrs | Nov 23 | Dec 1 | Dec 6 | Dec 11 | Dec 16 | Dec 21 | Dec 28 | Jan 4 | Jan 19 |
Freeze probabilities 1991–2020 at Hobart 4SE Mesonet, 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 73651 →Compare Hobart with another place →
Weather by month in Hobart
July is the warmest month at Hobart 4SE Mesonet, OK, averaging 96°F by day and 71°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 68% of years.
Warmth for growing adds up to 5,245 growing degree days a year (base 50°F), more than at 65% of the 114 Oklahoma stations. 38% of them (1,976) have built up by the end of June, and July adds the most, 1,035.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 51 | 28 | 100% | 25 | 12 |
| Feb | 55 | 31 | 100% | 18 | 45 |
| Mar | 64 | 39 | 98% | 8 | 152 |
| Apr | 72 | 47 | 68% | 3 | 305 |
| May | 82 | 57 | 2% | <1 | 602 |
| Jun | 91 | 67 | 0% | 0 | 861 |
| Jul | 96 | 71 | 0% | 0 | 1035 |
| Aug | 95 | 70 | 0% | 0 | 999 |
| Sep | 86 | 62 | 0% | 0 | 723 |
| Oct | 74 | 50 | 37% | 1 | 391 |
| Nov | 61 | 38 | 99% | 10 | 106 |
| Dec | 51 | 29 | 100% | 22 | 15 |
Monthly normals 1991–2020 at Hobart 4SE Mesonet, OK (1,568 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, Mangum, OK, 25 miles west of Hobart, has a last frost 1 day later (April 8), a first frost 2 days earlier (November 2), a season 2 days shorter.
When it snows in Hobart, Oklahoma
The first measurable snow (0.1 inch or more) in Hobart usually arrives around December 24, and the last of the season around February 8. Those are the middle dates across the winters of 1991–2020 at Retrop, OK, 18.2 miles away: half of years saw snow earlier, half later. Snow fell in 86% of those winters. The last 32°F night of spring typically comes 58 days after the last snow.
Planting calendar for 73651
| When | What to do |
|---|---|
| January 27 – February 10 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 10 – February 24 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 10 – March 24 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 7 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 12 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 21 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 4 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 73651 is 3 miles from Hobart 4SE Mesonet, OK, which stands at 1,568 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 73651 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.