One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The best time to plant nemesia in Portola Valley can be estimated by using the USDA zone info.

Planting Calendar for Nemesia

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

It's probably a bad idea to plant nemesia until after all chance of frost has passed because they do not do well in cold weather.

The earliest that you can plant nemesia 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 nemesia and expect a good harvest is probably September. Any later than that and your nemesia may not have a chance to grow to maturity. Starting your nemesia indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost is on January 31 in Portola Valley. In the coldest months of winter you can 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 will vary from year to year. Since half of the time in Portola Valley you get surprised by a frost after January 31 be ready to cover your nemesia 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.