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.

In Rohnert Park you can figure out when it's the best time to plant diascia by referring to the USDA zone info.

Planting Calendar for Diascia

Frost tolerance for diascia:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Diascia are one of those plants that can tolerate a little bit of cold weather which means that you can plant them a little bit earlier than other frost tender plants.

The earliest that you can plant diascia in Rohnert Park 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 diascia and expect a good harvest is probably October. If you wait any later than that and your diascia may not have a chance to fully mature. You can get started a few weeks earlier by starting your diascia indoors.

Last Frost Date

The average date of last frost is February 15 in Rohnert Park. In the coldest months of winter you should expect an average low temperature of 25°F.

Since the USDA zone info for Rohnert Park may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Rohnert Park you get a frost after February 15 so make sure that you are ready to cover your diascia if you have one of those late frosts.

USDA Zone Info for Rohnert Park

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 Rohnert Park

You may be interested in your other planting guides for Rohnert Park.