When to plant in Siloam Springs, AR
USDA Zone 7aSiloam Springs, Arkansas frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Heads up: the nearest complete-normals station is about 22 km from Siloam Springs, so your yard's frost dates can differ — a low spot or a paved city center can shift them by a week. Zone 7a means many perennials and even some tender shrubs overwinter in Siloam Springs, while your frost dates still decide when annuals go out.
Frost probability
KANSAS 2 NE · 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 Siloam Springs’s own odds, recorded at KANSAS 2 NE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 30 | Apr 13 | Mar 27 | Oct 10 | Oct 25 | Nov 6 |
| 32°F | Apr 18 | Mar 31 | Mar 13 | Oct 20 | Nov 2 | Nov 19 |
| 28°F | Apr 4 | Mar 19 | Feb 28 | Oct 28 | Nov 12 | Dec 1 |
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 Siloam Springs, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 28 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.
Siloam Springs planting FAQ
When is the last spring frost in Siloam Springs, AR?
On average, the last spring frost in Siloam Springs is around March 31 (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 Siloam Springs, AR?
In Siloam Springs, the first 32°F freeze of fall lands around November 2 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Siloam Springs in?
Siloam Springs is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Siloam Springs?
There are roughly 216 frost-free days in Siloam Springs (a long growing season), running from the average last frost around March 31 to the first fall frost near November 2.
When should I plant tomatoes in Siloam Springs?
In Siloam Springs, start tomato seeds indoors around February 3–February 17, then transplant seedlings outdoors around April 7 once the danger of frost has passed.
Never miss a window in Siloam Springs
An email when it’s time to start seeds, transplant, and sow — timed to Siloam Springs’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Centerton · 28 km
- Bentonville · 33 km
- Springdale · 34 km
- Lowell · 35 km
- Fayetteville · 35 km
- Rogers · 37 km
- Bella Vista · 39 km
- Tahlequah · 51 km
Frost dates recorded at KANSAS 2 NE, 22 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 Siloam Springs, AR — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00344672. Retrieved from https://blissgarden.com/arkansas/siloam-springs.