One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In San Leandro you can determine when it's a good idea to plant columbine by referring to the USDA zone info.

Planting Calendar for Columbine

Frost tolerance for columbine:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Columbine do well in a little bit of cold which means that you can plant them just a bit earlier in the year than other frost tender plants.

The earliest that you can plant columbine in San Leandro is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant columbine and expect a good harvest is probably October. Any later than that and your columbine may not have a chance to really do well. You can get started a little bit earlier by starting your columbine indoors.

Last Frost Date

On average all chance of frost has passed is on January 31 in San Leandro. In the coldest months of winter you should expect an average low temperature of 30°F.

Just be sure to remember that USDA zone info for San Leandro is not always accurate and the actual date of last frost can change quite a bit from year to year. Half of the time in San Leandro there is a last frost after January 31 so make sure that you are prepared to cover your columbine in the event of a late frost.

USDA Zone Info for San Leandro

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 San Leandro

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