Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. 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 Santa Rosa should be read to figure out when it's the best time to plant chrysanthemum.

Planting Calendar for Chrysanthemum

Frost tolerance for chrysanthemum:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Since chrysanthemum do not do well in cold weather it's important to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant chrysanthemum in Santa Rosa 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 chrysanthemum and expect a good harvest is probably September. If you wait any later than that and your chrysanthemum may not have a chance to grow to maturity. You can get started a little bit earlier by starting your chrysanthemum indoors.

Last Frost Date

In Santa Rosa the average date of last frost happens on February 15. It might get as low as 25°F during the coldest months of winter.

Keep in mind that USDA zone info for Santa Rosa is just an average and the actual date of last frost changes from year to year. Half of the time in Santa Rosa you get surprised by a frost after February 15 so be sure to be ready to protect your chrysanthemum in the event of a surprise late frost.

USDA Zone Info for Santa Rosa

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 Santa Rosa

You may be interested in your other planting guides for Santa Rosa.