The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A common way of determining when you can plant hypericum is to refer to the USDA zone info for Sunnyvale.

Planting Calendar for Hypericum

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

Hypericum are barely cold tolerant which tells us that you can start planting them slightly earlier than other frost tender plants.

The earliest that you can plant hypericum in Sunnyvale 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 hypericum and expect a good harvest is probably September. If you wait any later than that and your hypericum may not have a chance to really do well. You can get started a little bit earlier by starting your hypericum indoors.

Last Frost Date

On average the last frost is on February 15 in Sunnyvale. In the coldest months of winter you should expect an average low temperature of 25°F.

Since the USDA zone info for Sunnyvale may not be accurate from year to year the actual date of last frost will vary from year to year. Since half of the time in Sunnyvale it frosts late in the year after February 15 be ready to protect your hypericum in the event of one of those late frosts.

USDA Zone Info for Sunnyvale

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 Sunnyvale

You may be interested in your other planting guides for Sunnyvale.