One of the first steps you take when you are making a decision about your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Mill Valley you can determine when you can plant begonias by using the USDA zone info.

Planting Calendar for Begonias

Frost tolerance for begonias:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Begonias are not cold tolerant which means that you must wait until it warms up after the last frost before you can plant them.

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

Last Frost Date

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

Since the USDA zone info for Mill Valley is not always accurate the actual date of last frost is different every year. Since half of the time in Mill Valley you get a frost after January 31 be ready to protect your begonias in the event of a late frost.

USDA Zone Info for Mill 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 Mill Valley

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