One of the first steps you take when you are estimating your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

One way of making a decision about when it's possible to plant portulaca is to look at the USDA zone info for Boulder City.

Planting Calendar for Portulaca

Frost tolerance for portulaca:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Since portulaca are not cold tolerant you have to wait until after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant portulaca 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 portulaca and expect a good harvest is probably September. Any later than that and your portulaca may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your portulaca indoors.

Last Frost Date

On average all chance of frost has passed is on February 15 in Boulder City. It might get as low as 25°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Boulder City is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Boulder City last frost occurs after February 15 so be sure to be ready to protect your portulaca 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.