Fall in zone 7aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 74637 (Fairfax, OK)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Ralston, OK (9 miles away).
- Average last spring frostApr 1150% chance of a 32°F freeze after this date
- Average first fall frostOct 2450% chance of a 32°F freeze by this date
- Growing season (frost-free)196 daysmedian, 32°F threshold
- USDA hardiness zone7a0 to 5°F avg. coldest night
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This week in your yard
As of Oct 18, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
60°F 55°F or warmer
24-hour average · latest 57°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Stillwater 2 W (42 mi), Stillwater 5 WNW (42 mi), Abrams (44 mi).
4-inch depth
62°F 55°F or warmer
24-hour average · latest 61°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Stillwater 2 W (42 mi), Stillwater 5 WNW (42 mi), Abrams (44 mi).
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 74637 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 62°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent (annual bluegrass, winter weeds): window open as soil cools through the 70s and 60s.
Fertilizer window
Lawn region: South Central plains. Timing only; always follow the product label.
- Bermudagrass (warm-season): Spring: Several weeks after the lawn is fully green (April–May) (about May 27 here, using green-up about 3–4 weeks after your average last frost); Summer: Every 4–6 weeks through mid-August (heaviest feeder of the group); Late: Light, low-nitrogen/high-potassium feeding about 4 weeks before first frost, or skip. Avoid: Heavy late-fall nitrogen (linked to spring dead spot).
- Tall fescue (cool-season): Early fall: September (main feeding); Late fall: November, while still green; Late winter: Optional light feeding February–March. Avoid: Feeding after mid-spring and through summer in the transition zone (stress and brown patch).
Plant now
No vegetable planting windows are open this week.
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Oct 24: skip heavy pruning in the 6–8 weeks before it, because new growth may not harden off in time.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Mar 26 |
| 50% (the "average" last frost) | Apr 11 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 27 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Oct 7 |
| 50% (the "average" first frost) | Oct 24 |
| 90% (late: most years have frozen by now) | Nov 6 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 23 | Oct 14 |
| 32°F (freeze) | Apr 11 | Oct 24 |
| 28°F (hard freeze) | Mar 31 | Nov 1 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 74637
Dates count from your average last spring frost (Apr 11) and first fall frost (Oct 24). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Feb 14–28 | Apr 18–May 2 (transplant) | – |
| Pepper (sweet and hot) | Jan 31–Feb 14 | Apr 25–May 9 (transplant) | – |
| Eggplant | Jan 31–Feb 14 | Apr 25–May 9 (transplant) | – |
| Tomatillo | Feb 14–28 | Apr 18–May 2 (transplant) | – |
| Lettuce | Feb 14–28 | Mar 21–Apr 11 (transplant) Mar 14–Apr 25 (sow outdoors) | Aug 29–Sep 19 (transplant) Aug 15–Sep 12 (sowing) |
| Spinach | – | Feb 28–Mar 21 (sow outdoors) | Aug 29–Sep 19 (sowing) |
| Kale | Feb 14–28 | Mar 14–28 (transplant) Mar 14–28 (sow outdoors) | Aug 1–29 (transplant) Jul 18–Aug 15 (sowing) |
| Collards | Feb 14–28 | Mar 14–Apr 11 (transplant) Mar 14–Apr 11 (sow outdoors) | Aug 1–29 (transplant) Jul 18–Aug 15 (sowing) |
| Broccoli | Jan 31–Feb 14 | Mar 14–28 (transplant) | Jul 18–Aug 15 (transplant) |
| Cabbage | Jan 31–Feb 14 | Mar 14–28 (transplant) | Jul 18–Aug 15 (transplant) |
| Cauliflower | Jan 31–Feb 14 | Mar 28–Apr 11 (transplant) | Jul 18–Aug 15 (transplant) |
| Brussels sprouts | Jan 17–31 | Mar 14–28 (transplant) | Jul 4–25 (transplant) |
| Kohlrabi | Feb 14–28 | Mar 14–28 (transplant) Mar 14–28 (sow outdoors) | Aug 15–29 (sowing) |
| Bok choy / Asian greens | – | Mar 14–28 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Arugula | – | Mar 14–Apr 11 (sow outdoors) | Aug 29–Sep 26 (sowing) |
| Mustard greens | – | Mar 14–Apr 4 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Swiss chard | Feb 28–Mar 14 | Mar 28–Apr 18 (transplant) Mar 28–Apr 25 (sow outdoors) | Aug 15–29 (sowing) |
| Beet | – | Mar 14–Apr 11 (sow outdoors) | Aug 15–29 (sowing) |
| Carrot | – | Mar 21–Apr 18 (sow outdoors) | Aug 1–15 (sowing) |
| Radish | – | Mar 7–Apr 18 (sow outdoors) | Sep 12–26 (sowing) |
| Turnip | – | Mar 14–Apr 4 (sow outdoors) | Aug 15–29 (sowing) |
| Parsnip | – | Mar 21–Apr 11 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 14–Mar 14 (sow outdoors) | Aug 1–15 (sowing) |
| Onion (bulbing) | Jan 17–31 | Feb 28–Mar 14 (transplant) | – |
| Green onion / scallion | – | Feb 28–Mar 28 (sow outdoors) | Aug 15–29 (sowing) |
| Leek | Jan 17–31 | Mar 14–28 (transplant) | – |
| Garlic | – | – | Sep 12–Oct 10 (sowing) |
| Shallot | – | Feb 28–Mar 14 (transplant) | Sep 12–Oct 10 (sowing) |
| Potato | – | Mar 14–28 (transplant) | Jul 4–18 (transplant) |
| Sweet potato | – | May 2–16 (transplant) | – |
| Sweet corn | – | Apr 18–May 2 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 18–May 2 (sow outdoors) | – |
| Bean, pole | – | Apr 18–May 2 (sow outdoors) | – |
| Lima bean | – | Apr 25–May 9 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 2–23 (sow outdoors) | – |
| Cucumber | Mar 14–21 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Summer squash / zucchini | Mar 14–21 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Winter squash | Mar 14–21 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Pumpkin | – | Apr 18–May 2 (sow outdoors) | – |
| Watermelon | Mar 14–21 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 14–21 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Okra | Feb 28–Mar 14 | Apr 25–May 9 (transplant) Apr 25–May 9 (sow outdoors) | – |
| Celery | Jan 17–31 | Apr 18–25 (transplant) | – |
| Basil | Feb 28–Mar 14 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Cilantro | – | Mar 28–Apr 25 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Parsley | Jan 31–Feb 14 | Mar 28–Apr 11 (transplant) Mar 21–Apr 11 (sow outdoors) | – |
| Dill | – | Apr 11–25 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Sunflower | – | Apr 11–25 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 14–28 (transplant) | – |
| Rhubarb (crowns) | – | Mar 14–28 (transplant) | – |
| Strawberry (plants) | – | Mar 14–28 (transplant) | Aug 15–Sep 12 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Plants that do well here
Oklahoma has a university or garden plant program: Oklahoma Proven. Plant frost-tender annuals after April 11 here (the average last frost). Not affiliated with the program.
Where these numbers come from
Station: Ralston, OK (NOAA GHCN-Daily ID USC00347390), elevation 825 ft, 8.8 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Pawhuska, OK | 17 mi | Apr 6 | Oct 29 |
| Newkirk 8E Mesonet, OK | 25 mi | Apr 6 | Oct 30 |
| Barnsdall, OK | 27 mi | Mar 31 | Oct 31 |
The average last-frost dates of these stations span 11 days, a rough guide to local variation. See data sources & methods.
Frost questions for 74637
When is the last frost in 74637?
The average (50% chance) last spring freeze of 32°F for ZIP 74637 is April 11. For a more cautious planting date, use April 27, when only 1 year in 10 still sees a later freeze.
When is the first frost in 74637?
The average first fall freeze is October 24. In 1 year in 10 it comes by October 7.
What hardiness zone is 74637?
ZIP 74637 is in USDA zone 7a (0 to 5°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 74637 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
74650 Ralston 74633 Burbank 74652 Shidler 74058 Pawnee 74084 Wynona 74641 Kaw City 74604 Ponca City 74035 Hominy
Other ZIP codes in Osage County
74001 74002 74003 74035 74054 74056 74060 74070 74073 74084 74126 74127 74604 74633 74650 74652 All Osage County frost dates · Oklahoma frost dates
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Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.