When to plant in Guymon, OK
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Guymon, Oklahoma — all computed from Guymon's nearest NOAA weather station.
In zone 6b, Guymon gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
GUYMON MUNI AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Guymon’s own odds, recorded at GUYMON MUNI AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 10 | Apr 28 | Apr 14 | Oct 2 | Oct 14 | Oct 26 |
| 32°F | May 1 | Apr 18 | Apr 4 | Oct 11 | Oct 23 | Nov 3 |
| 28°F | Apr 23 | Apr 8 | Mar 23 | Oct 19 | Nov 1 | Nov 12 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Guymon, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Guymon planting FAQ
When is the last spring frost in Guymon, OK?
On average, the last spring frost in Guymon is around April 18 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Guymon, OK?
In Guymon, the first 32°F freeze of fall lands around October 23 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Guymon in?
Guymon is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Guymon?
Guymon has about 188 frost-free days — a moderate growing season — between the average last spring frost (April 18) and first fall frost (October 23).
When should I plant tomatoes in Guymon?
For Guymon, sow tomatoes indoors about February 21–March 7 and move the seedlings out around April 25, after the last spring frost.
Never miss a window in Guymon
An email when it’s time to start seeds, transplant, and sow — timed to Guymon’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Liberal · 63 km
- Dumas · 102 km
- Borger · 115 km
- Pampa · 135 km
- Garden City · 153 km
- Amarillo · 169 km
- Dodge City · 176 km
- Woodward · 187 km
Frost dates recorded at GUYMON MUNI AP, 3 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Guymon, OK — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00003030. Retrieved from https://blissgarden.com/oklahoma/guymon.