One of the first steps you take when you are getting a good idea 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.

The USDA zone info for Rancho Mirage should be used to determine when it's possible to plant hardy asters.

Planting Calendar for Hardy Asters

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

Hardy Asters are one of those plants that can tolerate a tiny bit of cold weather which means that you can plant them slightly earlier than more sensitive plants.

The earliest that you can plant hardy asters in Rancho Mirage 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 hardy asters and expect a good harvest is probably September. If you wait any later than that and your hardy asters may not have a chance to really do well. You can get started a few weeks earlier by starting your hardy asters indoors.

Last Frost Date

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

Keep in mind that USDA zone info for Rancho Mirage may not be accurate from year to year and the actual date of last frost changes from year to year. Since half of the time in Rancho Mirage you get surprised by a frost after February 15 be ready to protect your hardy asters in the event of a late frost.

USDA Zone Info for Rancho Mirage

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 Rancho Mirage

You may be interested in your other planting guides for Rancho Mirage.