The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Boulder City you can estimate when it's the best time to plant angelonia by referring to the USDA zone info.

Planting Calendar for Angelonia

Frost tolerance for angelonia:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Angelonia tend to make it in very little cold which tells us that you can plant them slightly earlier in the year than plants that are more sensitive to the cold.

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

The last month that you can plant angelonia and expect a good harvest is probably September. If you wait any later than that and your angelonia may not have a chance to really do well. You can get started a couple of weeks earlier by starting your angelonia indoors.

Last Frost Date

In Boulder City the average date of last frost happens on February 15. You can expect an average low temperature of 25°F in the coldest months of winter.

Since the USDA zone info for Boulder City is just an average the actual date of last frost will vary from year to year. Half of the time in Boulder City you get surprised by a frost after February 15 so make sure that you are prepared to protect your angelonia in the event of one of those late frosts.

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.