One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A common way of getting a good idea when it's possible to plant aurinia is to refer to the USDA zone info for Boulder City.

Planting Calendar for Aurinia

Frost tolerance for aurinia:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Aurinia can survive in cold weather which tells us that you can plant them a lot earlier in the year than other plants that might not handle the cold.

The earliest that you can plant aurinia in Boulder City is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant aurinia and expect a good harvest is probably October. You probably don't want to wait any later than that or else your aurinia may not have a chance to grow to maturity. Starting your aurinia indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is February 15 in Boulder City. It might get as low as 25°F during the coldest months of winter.

Since the USDA zone info for Boulder City may not be accurate from year to year the actual date of last frost will vary from year to year. Since half of the time in Boulder City you get surprised by a frost after February 15 be ready to cover your aurinia in the event of a surprise late frost.

USDA Zone Info for Boulder City

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Boulder City

You may be interested in your other planting guides for Boulder City.