Bullhead City, AZ planting zone & frost dates
Bullhead City is in USDA hardiness zone 9b. The last spring frost usually comes around January 4 and the first fall frost around December 23, for a growing season of about 356 days.
Planting calendar for Bullhead City
Dates are counted from the average last spring frost (January 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: Nov 9 – Nov 23 Transplant outdoors: Jan 11 – Jan 18 |
| Peppers | Start seeds indoors: Oct 26 – Nov 9 Transplant outdoors: Jan 18 – Jan 25 |
| Eggplant | Start seeds indoors: Oct 26 – Nov 9 Transplant outdoors: Jan 18 – Jan 25 |
| Broccoli | Start seeds indoors: Oct 26 – Nov 9 Transplant outdoors: Dec 7 – Dec 21 |
| Cabbage | Start seeds indoors: Oct 26 – Nov 9 Transplant outdoors: Dec 7 – Dec 21 |
| Onions (sets) | Plant outdoors: Dec 7 – Dec 21 |
| Peas | Sow outdoors: Nov 23 – Dec 7 |
| Spinach | Sow outdoors: Nov 23 – Dec 7 |
| Lettuce | Sow outdoors: Dec 7 – Dec 21 |
| Carrots | Sow outdoors: Dec 7 – Dec 21 |
| Potatoes | Plant outdoors: Dec 7 – Dec 21 |
| Beans | Sow outdoors: Jan 11 – Jan 18 |
| Sweet corn | Sow outdoors: Jan 11 – Jan 18 |
| Cucumbers | Sow outdoors: Jan 11 – Jan 18 |
| Squash & zucchini | Sow outdoors: Jan 11 – Jan 18 |
| Basil | Start seeds indoors: Nov 23 – Dec 7 Transplant outdoors: Jan 11 – Jan 18 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Oct 28 (8 weeks before the average first fall frost on Dec 23).
Useful for zone 9b 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
- Shade cloth — for hot summers
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Dec 12 | Jan 4 | Feb 5 |
| First 32°F frost in fall is before | Jan 23 | Dec 23 | Dec 1 |
How to read it: in spring there is a 10% chance of a frost after February 5, so that is a safe date for tender plants. In fall there is a 10% chance of frost before December 1. A hard freeze (28°F) usually ends around December 26.
Hardiness zone by ZIP code in Bullhead City
- 86429 zone 9b
- 86430 zone 10a
- 86439 zone 9b
- 86442 zone 10a
Nearby cities
- Kingman zone 8b, last frost Apr 2
- New Kingman-Butler zone 8b, last frost Apr 2
- Lake Havasu City zone 10a
- Chino Valley zone 8a, last frost Apr 27
- Prescott zone 7b, last frost Apr 30
- Prescott Valley zone 7b, last frost Apr 20
- Yuma zone 10a
- Fortuna Foothills zone 10a
Questions
What growing zone is Bullhead City, AZ?
Bullhead City is in USDA Plant Hardiness Zone 9b (average extreme winter low 25°F to 30°F), according to the USDA 2023 map. Some ZIP codes of the city fall in zone 10a.
When is the last frost in Bullhead City?
The average last spring frost (32°F) in Bullhead City is January 4. There is still a 10% chance of frost until February 5.
When can I plant tomatoes in Bullhead City?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Jan 11 – Jan 18. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Bullhead City, AZ (USC00021050), 0.7 km (0.4 mi) from the city center, elevation 162 m, based on 23 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.