Cedar City, UT planting zone & frost dates
Cedar City is in USDA hardiness zone 6b. The last spring frost usually comes around May 4 and the first fall frost around October 13, for a growing season of about 159 days.
Planting calendar for Cedar City
Dates are counted from the average last spring frost (May 4) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Mar 9 – Mar 23 Transplant outdoors: May 11 – May 18 |
| Peppers | Start seeds indoors: Feb 23 – Mar 9 Transplant outdoors: May 18 – May 25 |
| Eggplant | Start seeds indoors: Feb 23 – Mar 9 Transplant outdoors: May 18 – May 25 |
| Broccoli | Start seeds indoors: Feb 23 – Mar 9 Transplant outdoors: Apr 6 – Apr 20 |
| Cabbage | Start seeds indoors: Feb 23 – Mar 9 Transplant outdoors: Apr 6 – Apr 20 |
| Onions (sets) | Plant outdoors: Apr 6 – Apr 20 |
| Peas | Sow outdoors: Mar 23 – Apr 6 |
| Spinach | Sow outdoors: Mar 23 – Apr 6 |
| Lettuce | Sow outdoors: Apr 6 – Apr 20 |
| Carrots | Sow outdoors: Apr 6 – Apr 20 |
| Potatoes | Plant outdoors: Apr 6 – Apr 20 |
| Beans | Sow outdoors: May 11 – May 18 |
| Sweet corn | Sow outdoors: May 11 – May 18 |
| Cucumbers | Sow outdoors: May 11 – May 18 |
| Squash & zucchini | Sow outdoors: May 11 – May 18 |
| Basil | Start seeds indoors: Mar 23 – Apr 6 Transplant outdoors: May 11 – May 18 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 18 (8 weeks before the average first fall frost on Oct 13).
Useful for zone 6b gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Cold frame / mini greenhouse — adds weeks to a short season
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 19 | May 4 | May 28 |
| First 32°F frost in fall is before | Oct 28 | Oct 13 | Sep 30 |
How to read it: in spring there is a 10% chance of a frost after May 28, so that is a safe date for tender plants. In fall there is a 10% chance of frost before September 30. A hard freeze (28°F) usually ends around April 22.
Hardiness zone by ZIP code in Cedar City
- 84720 zone 6b
- 84721 zone 6b
Nearby cities
- Hurricane zone 8a, last frost Apr 1
- Washington zone 8b, last frost Mar 14
- Saint George zone 8b, last frost Mar 14
- Santaquin zone 6b, last frost May 4
- Payson zone 7a, last frost May 4
- Spanish Fork zone 7a, last frost Apr 25
- Eagle Mountain zone 6b, last frost Jun 2
- Springville zone 7a, last frost Apr 25
Questions
What growing zone is Cedar City, UT?
Cedar City is in USDA Plant Hardiness Zone 6b (average extreme winter low -5°F to 0°F), according to the USDA 2023 map.
When is the last frost in Cedar City?
The average last spring frost (32°F) in Cedar City is May 4. There is still a 10% chance of frost until May 28.
When can I plant tomatoes in Cedar City?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 11 – May 18. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Cedar City, UT (USC00421259), 2.3 km (1.4 mi) from the city center, elevation 1856 m, based on 16 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.