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.

In Portola Valley you can figure out when it's the best time to plant painted tongues by looking at the USDA zone info.

Planting Calendar for Painted Tongues

Frost tolerance for painted tongues:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

You should not plant painted tongues until after the last frost because they are not cold tolerant.

The earliest that you can plant painted tongues in Portola Valley 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 painted tongues and expect a good harvest is probably September. You probably don't want to wait any later than that or else your painted tongues may not have a chance to fully mature. Starting your painted tongues indoors is a great way to get them started a few weeks earlier.

Last Frost Date

In Portola Valley the average date of last frost happens on January 31. You should expect an average low temperature of 30°F in the coldest months of winter.

Just be sure to remember that USDA zone info for Portola Valley is not always accurate and the actual date of last frost is different every year. Half of the time in Portola Valley you get a frost after January 31 so make sure that you are ready to cover your painted tongues if you have one of those late frosts.

USDA Zone Info for Portola Valley

Here is the info for USDA Zone 10a.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	30°F
Highest Expected Low	35°F

This means that on a really cold year, the coldest it will get is 30°F. On most years you should be prepared to experience lows near 35°F.

Plants to Grow in Portola Valley

You may be interested in your other planting guides for Portola Valley.