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.

It's possible to determine when it's the best time to plant achimenes by referring to the USDA zone info for Boulder City.

Planting Calendar for Achimenes

Frost tolerance for achimenes:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

Achimenes are not cold tolerant which tells us that you must wait until it warms up after the last frost before you can plant them.

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

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

Last Frost Date

The average date of last frost is February 15 in Boulder City. You can expect an average low temperature of 25°F in 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 changes from year to year. Since half of the time in Boulder City last frost occurs after February 15 be ready to protect your achimenes if you have 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.