Riverton, UT planting zone & frost dates
Riverton is in USDA hardiness zone 7a. The last spring frost usually comes around April 18 and the first fall frost around October 22, for a growing season of about 185 days.
Planting calendar for Riverton
Dates are counted from the average last spring frost (April 18) 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: Feb 21 – Mar 7 Transplant outdoors: Apr 25 – May 2 |
| Peppers | Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: May 2 – May 9 |
| Eggplant | Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: May 2 – May 9 |
| Broccoli | Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: Mar 21 – Apr 4 |
| Cabbage | Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: Mar 21 – Apr 4 |
| Onions (sets) | Plant outdoors: Mar 21 – Apr 4 |
| Peas | Sow outdoors: Mar 7 – Mar 21 |
| Spinach | Sow outdoors: Mar 7 – Mar 21 |
| Lettuce | Sow outdoors: Mar 21 – Apr 4 |
| Carrots | Sow outdoors: Mar 21 – Apr 4 |
| Potatoes | Plant outdoors: Mar 21 – Apr 4 |
| Beans | Sow outdoors: Apr 25 – May 2 |
| Sweet corn | Sow outdoors: Apr 25 – May 2 |
| Cucumbers | Sow outdoors: Apr 25 – May 2 |
| Squash & zucchini | Sow outdoors: Apr 25 – May 2 |
| Basil | Start seeds indoors: Mar 7 – Mar 21 Transplant outdoors: Apr 25 – May 2 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 27 (8 weeks before the average first fall frost on Oct 22).
Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Mar 31 | Apr 18 | May 6 |
| First 32°F frost in fall is before | Nov 5 | Oct 22 | Oct 7 |
How to read it: in spring there is a 10% chance of a frost after May 6, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 7. A hard freeze (28°F) usually ends around March 31.
Hardiness zone by ZIP code in Riverton
- 84065 zone 7a
Nearby cities
- Bluffdale zone 7a, last frost Apr 18
- South Jordan zone 7a, last frost Apr 18
- Draper zone 7a, last frost Apr 18
- West Jordan zone 7b, last frost Apr 29
- Sandy zone 7b, last frost Apr 29
- Herriman zone 7a, last frost Apr 18
- Midvale zone 7b, last frost Apr 29
- Oquirrh zone 7b, last frost Apr 8
Questions
What growing zone is Riverton, UT?
Riverton is in USDA Plant Hardiness Zone 7a (average extreme winter low 0°F to 5°F), according to the USDA 2023 map.
When is the last frost in Riverton?
The average last spring frost (32°F) in Riverton is April 18. There is still a 10% chance of frost until May 6.
When can I plant tomatoes in Riverton?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 25 – May 2. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Draper-Point Of Mtn, UT (USC00422235), 5.0 km (3.1 mi) from the city center, elevation 1373 m, based on 15 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.