Before planting it is a good idea to find your USDA Zone info to estimate your garden 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 you can plant clover by looking at the USDA zone info for Portola Valley.

Planting Calendar for Clover

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

Clover are one of those plants that can tolerate a tiny bit of cold weather which means that you can plant them slightly earlier than other plants that might not handle the cold.

The earliest that you can plant clover 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 clover and expect a good harvest is probably September. Any later than that and your clover may not have a chance to really do well. Starting your clover indoors is a great way to get them started a little bit earlier.

Last Frost Date

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

Since the USDA zone info for Portola Valley may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Portola Valley last frost occurs after January 31 so make sure that you are prepared to cover your clover if you have a surprise late frost.

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.