USDA hardiness zone lookup
Saint George, UT — USDA Zone 8b
Saint George, Utah · 238-day growing season
Frost dates and growing season in Saint George
| USDA hardiness zone | Zone 8b |
|---|---|
| Average last spring frost | March 15 |
| Average first fall frost | November 8 |
| Growing season length | ~238 days |
| Temperature range (F) | 10 to 20°F |
| Temperature range (C) | -12 to -7°C |
All of Saint George's mapped ZIP codes fall in the same hardiness band, Zone 8b.
These are 50%-probability averages modeled from Saint George's USDA hardiness zone and regional climate normals — not a single-station reading. In a typical year the last spring frost will have passed by March 15, but a colder-than-average year can run 1-2 weeks later. Plant tender crops (tomatoes, peppers, basil) once both soil and night temperatures are consistently warm — a thermometer beats the calendar.
Growing season in Saint George
Saint George, Utah sits in USDA Zone 8b, with roughly 238 frost-free days between an average last spring frost around March 15 and a first fall frost around November 8. That is a long season — succession-sow through summer and run a full fall crop; heat-sensitive greens still need spring/autumn timing.
What grows in Saint George
Saint George falls in USDA Zone 8b, so the same hardiness constraints apply as the full Zone 8 guide. Vegetables, herbs, and fruit trees rated to Zone 8b (or hardier) will overwinter here in a typical year.
- Tomatoes (spring + fall plantings)
- Peppers (sweet + hot)
- Okra
- Sweet potatoes
- Southern peas
- Melons, watermelon
- Figs
- Pomegranates
- Citrus (in protected spots — Meyer lemon)
- Pecans
What to plant in Saint George this week
Saint George is in high summer — most spring plantings are in. Keep an eye on watering and start planning your fall crop. Cool-season seedlings (broccoli, cabbage, lettuce) can be started indoors for a fall transplant.
- When to plant tomatoes in zone 8
- When to plant peppers in zone 8
- When to plant bush beans in zone 8
- When to plant cucumbers in zone 8
- When to plant basil in zone 8
Full planting calendar for Saint George
Crop-by-crop sowing, transplant, and harvest dates calibrated to zone 8 averages:
- When to plant tomatoes in zone 8
- When to plant peppers in zone 8
- When to plant basil in zone 8
- When to plant garlic in zone 8
- When to plant lettuce in zone 8
- When to plant bush beans in zone 8
- When to plant cucumbers in zone 8
- When to plant summer squash in zone 8
- When to plant peas in zone 8
- When to plant carrots in zone 8
ZIP codes in Saint George
Drill down to the precise frost window and planting calendar for a specific ZIP in Saint George:
Local microclimate notes
Zone tables give you the average — but Saint Georgegardens vary. South-facing walls and paved areas can run a full half-zone warmer than the published rating. Low-lying spots, frost pockets, and shaded north sides can run colder. If you've gardened here a few seasons, your own frost record — the last time you actually got frost damage — beats any national average.
Source and methodology
Hardiness zone from the USDA Plant Hardiness Zone Map (2023 revision). Frost-date and growing-season figures are modeled from Saint George's USDA hardiness zone and regional NOAA 1991-2020 climate normals — zone-level estimates, not a per-station record, so treat them as planning guidance and confirm against your own local frost history. Crop recommendations draw on US Cooperative Extension references, curated by the Growli editorial team. Last reviewed June 2026.
Other cities in Utah
- Clearfield, UT — USDA Zone 6b
- Logan, UT — USDA Zone 5b
- Midvale, UT — USDA Zone 7a
- Ogden, UT — USDA Zone 7a
- Orem, UT — USDA Zone 6b
- Provo, UT — USDA Zone 6b
- Salt Lake City, UT — USDA Zone 7a
- Sandy, UT — USDA Zone 6b
- South Jordan, UT — USDA Zone 6b
- West Jordan, UT — USDA Zone 7a
- West Valley City, UT — USDA Zone 7a
- All of Utah by zone