One of the first steps you take when you are determining your gardening schedule is find your 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.

You should be able to estimate when it's the best time to plant borage by looking at the USDA zone info for Signal Hill.

Planting Calendar for Borage

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

Borage are moderately cold tolerant which means that you can get them planted earlier than other frost tender plants.

The earliest that you can plant borage in Signal Hill 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 borage and expect a good harvest is probably October. If you wait any later than that and your borage may not have a chance to really do well. You can get started a few weeks earlier by starting your borage indoors.

Last Frost Date

The average date of last frost is January 31 in Signal Hill. It might get as low as 35°F during the coldest months of winter.

Since the USDA zone info for Signal Hill is an average the actual date of last frost will vary from year to year. Half of the time in Signal Hill you get a frost after January 31 so make sure that you are ready to protect your borage in the event of one of those late frosts.

USDA Zone Info for Signal Hill

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 Signal Hill

You may be interested in your other planting guides for Signal Hill.