USDA Hardiness Zone 7b
Frost Dates for 73550 — Hollis, Oklahoma
NOAA 1991–2020 normals from Hollis 5E Mesonet, OK (1,630 ft), 4 miles east.
Updated
In Hollis, the last spring frost (32°F) is around April 5 in half of years and has passed by April 21 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 208 days (NOAA, Hollis 5E Mesonet, OK).
- Last spring frost
- April 5
- First fall frost
- October 31
- Growing season
- 208 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
- January 6
- Last snow
- February 17
- Winters with snow
- 85%
- Snow per year
- 3.3"
median, 1991–2020
median, 1991–2020
17 of 20 observed
NOAA normal
Frost risk by date in Hollis
Half of springs at Hollis 5E Mesonet, OK see their last 32°F night by April 5; only one in ten is past it by March 18, and one in ten still has one after April 21. Planting tender crops after April 12 leaves a 30% risk of a frost on them, after April 16 20%, and after April 21 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 16 one year in ten, and holds off past November 14 one year in ten. A hard freeze of 28°F follows 7 days later, around November 7; in spring the one-in-ten date for 28°F is April 12, 9 days before the 32°F one. The freeze-free season lasts 208 days in a typical year, shorter than at 62% of the 114 Oklahoma stations; it reaches 230 days one year in ten and falls short of 186 one year in ten. On average 89 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 15, and return around October 23. Severe cold of 16°F or below comes in 99% of winters, usually between December 14 and February 14.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 31 | Apr 4 | Apr 8 | Apr 12 | Apr 15 | Apr 18 | Apr 21 | Apr 24 | Apr 30 |
| 32°F | Mar 18 | Mar 24 | Mar 30 | Apr 2 | Apr 5 | Apr 8 | Apr 12 | Apr 16 | Apr 21 |
| 28°F | Mar 4 | Mar 11 | Mar 15 | Mar 20 | Mar 25 | Mar 30 | Apr 2 | Apr 6 | Apr 12 |
| 24°F | Feb 22 | Feb 28 | Mar 3 | Mar 7 | Mar 12 | Mar 15 | Mar 21 | Mar 28 | Apr 3 |
| 20°F | Feb 3 | Feb 13 | Feb 19 | Feb 25 | Feb 28 | Mar 3 | Mar 7 | Mar 12 | Mar 19 |
| 16°F99% of yrs | Jan 15 | Jan 25 | Jan 31 | Feb 6 | Feb 14 | Feb 21 | Feb 26 | Mar 2 | Mar 9 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 8 | Oct 13 | Oct 17 | Oct 20 | Oct 23 | Oct 25 | Oct 28 | Oct 31 | Nov 4 |
| 32°F | Oct 16 | Oct 21 | Oct 25 | Oct 28 | Oct 31 | Nov 3 | Nov 5 | Nov 9 | Nov 14 |
| 28°F | Oct 22 | Oct 30 | Nov 2 | Nov 5 | Nov 7 | Nov 11 | Nov 15 | Nov 19 | Nov 26 |
| 24°F | Oct 31 | Nov 5 | Nov 9 | Nov 13 | Nov 17 | Nov 21 | Nov 27 | Dec 1 | Dec 6 |
| 20°F | Nov 8 | Nov 15 | Nov 20 | Nov 25 | Nov 30 | Dec 3 | Dec 8 | Dec 13 | Dec 21 |
| 16°F99% of yrs | Nov 18 | Nov 28 | Dec 3 | Dec 8 | Dec 14 | Dec 20 | Dec 25 | Jan 1 | Jan 13 |
Freeze probabilities 1991–2020 at Hollis 5E 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 73550 →Compare Hollis with another place →
Compared with the next station
The nearest other station, Wellington, TX, 20 miles northwest of Hollis and 410 feet higher, has a last frost 4 days earlier (April 1), a first frost 4 days later (November 4), a season 7 days longer.
When it snows in Hollis, Oklahoma
The first measurable snow (0.1 inch or more) in Hollis usually arrives around January 6, and the last of the season around February 17. Those are the middle dates across the winters of 1991–2020 at Hollis 5E, OK, 5.5 miles away: half of years saw snow earlier, half later. Snow fell in 85% of those winters. The last 32°F night of spring typically comes 47 days after the last snow.
Planting calendar for 73550
| When | What to do |
|---|---|
| January 25 – February 8 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 8 – February 22 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 8 – March 22 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 5 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 73550 is 4 miles from Hollis 5E Mesonet, OK, which stands at 1,630 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 73550 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.