Eagle Mountain, UT planting zone & frost dates
Eagle Mountain is in USDA hardiness zone 6b. The last spring frost usually comes around June 2 and the first fall frost around September 16, for a growing season of about 103 days.
Planting calendar for Eagle Mountain
Dates are counted from the average last spring frost (June 2) 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: Apr 7 – Apr 21 Transplant outdoors: Jun 9 – Jun 16 |
| Peppers | Start seeds indoors: Mar 24 – Apr 7 Transplant outdoors: Jun 16 – Jun 23 |
| Eggplant | Start seeds indoors: Mar 24 – Apr 7 Transplant outdoors: Jun 16 – Jun 23 |
| Broccoli | Start seeds indoors: Mar 24 – Apr 7 Transplant outdoors: May 5 – May 19 |
| Cabbage | Start seeds indoors: Mar 24 – Apr 7 Transplant outdoors: May 5 – May 19 |
| Onions (sets) | Plant outdoors: May 5 – May 19 |
| Peas | Sow outdoors: Apr 21 – May 5 |
| Spinach | Sow outdoors: Apr 21 – May 5 |
| Lettuce | Sow outdoors: May 5 – May 19 |
| Carrots | Sow outdoors: May 5 – May 19 |
| Potatoes | Plant outdoors: May 5 – May 19 |
| Beans | Sow outdoors: Jun 9 – Jun 16 |
| Sweet corn | Sow outdoors: Jun 9 – Jun 16 |
| Cucumbers | Sow outdoors: Jun 9 – Jun 16 |
| Squash & zucchini | Sow outdoors: Jun 9 – Jun 16 |
| Basil | Start seeds indoors: Apr 21 – May 5 Transplant outdoors: Jun 9 – Jun 16 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Jul 22 (8 weeks before the average first fall frost on Sep 16).
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 | May 18 | Jun 2 | Jun 24 |
| First 32°F frost in fall is before | Sep 29 | Sep 16 | Sep 1 |
How to read it: in spring there is a 10% chance of a frost after June 24, so that is a safe date for tender plants. In fall there is a 10% chance of frost before September 1. A hard freeze (28°F) usually ends around May 19.
Hardiness zone by ZIP code in Eagle Mountain
- 84005 zone 6b
Nearby cities
- Saratoga Springs zone 7a, last frost Apr 30
- Lehi zone 7a, last frost Apr 30
- Bluffdale zone 7a, last frost Apr 18
- Herriman zone 7a, last frost Apr 18
- Riverton zone 7a, last frost Apr 18
- American Fork zone 7a, last frost Apr 17
- Highland zone 7a, last frost May 3
- Draper zone 7a, last frost Apr 18
Questions
What growing zone is Eagle Mountain, UT?
Eagle Mountain 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 Eagle Mountain?
The average last spring frost (32°F) in Eagle Mountain is June 2. There is still a 10% chance of frost until June 24.
When can I plant tomatoes in Eagle Mountain?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Jun 9 – Jun 16. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Fairfield, UT (USC00422696), 9.1 km (5.7 mi) from the city center, elevation 1487 m, based on 22 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.