The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A way of getting a good idea when it's the best time to plant iresene is to check out the USDA zone info for Cupertino.

Planting Calendar for Iresene

Frost tolerance for iresene:	Not tolerant of frost.
When to plant:	After the last frost.

Since iresene do not do well in cold weather you really should wait until after the last frost before you can plant them.

The earliest that you can plant iresene in Cupertino 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 iresene and expect a good harvest is probably September. Any later than that and your iresene may not have a chance to really do well. You can get started a few weeks earlier by starting your iresene indoors.

Last Frost Date

In Cupertino the average date of last frost happens on February 15. In the coldest months of winter you should expect an average low temperature of 25°F.

It's important to remember that USDA zone info for Cupertino is not always accurate and the actual date of last frost can change quite a bit from year to year. Half of the time in Cupertino there is a last frost after February 15 so just be sure to be ready to cover your iresene if you have a late frost.

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.