One of the first steps you take when you are determining 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.

The first chance to plant asparagus lettuce in San Francisco should be determined by checking out the USDA zone info.

Planting Calendar for Asparagus lettuce

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

Asparagus lettuce require warm weather which tells us that you must wait until it warms up after the last frost before you can plant them.

The earliest that you can plant asparagus lettuce in San Francisco 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 asparagus lettuce and expect a good harvest is probably September. You probably don't want to wait any later than that or else your asparagus lettuce may not have a chance to fully mature. You can get started a few weeks earlier by starting your asparagus lettuce indoors.

Last Frost Date

On average all chance of frost has passed is on January 31 in San Francisco. It might get as low as 35°F during the coldest months of winter.

Remember that USDA zone info for San Francisco may not be accurate from year to year and the actual date of last frost is different every year. Half of the time in San Francisco you get a frost after January 31 so always be ready to cover your asparagus lettuce if you have one of those late frosts.

USDA Zone Info for San Francisco

Here is the info for USDA Zone 10b.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	35°F
Highest Expected Low	40°F

This means that on a really cold year, the coldest it will get is 35°F. On most years you should be prepared to experience lows near 40°F.

Plants to Grow in San Francisco

You may be interested in your other planting guides for San Francisco.