The USDA Zone info is a great tool for gardeners to help us determine 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.

It's possible to estimate when to plant foxglove by reviewing the USDA zone info for Cupertino.

Planting Calendar for Foxglove

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

Foxglove are moderately cold tolerant which means that you can plant them earlier than more sensitive plants.

The earliest that you can plant foxglove in Cupertino 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 foxglove and expect a good harvest is probably October. Any later than that and your foxglove may not have a chance to grow to maturity. Starting your foxglove indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

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

Keep in mind that USDA zone info for Cupertino is just an average and the actual date of last frost is different every year. Half of the time in Cupertino you get surprised by a frost after February 15 so just be sure to be ready to cover your foxglove in the event of one of those late frosts.

USDA Zone Info for Cupertino

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 Cupertino

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