The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A way of figuring out when it's the best time to plant borage is to consult the USDA zone info for Rosenberg.

Planting Calendar for Borage

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

Since borage are moderately cold tolerant you can plant them a bit earlier in the year than other frost tender plants.

The earliest that you can plant borage in Rosenberg 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. Any later than that and your borage may not have a chance to really do well. Starting your borage indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is February 15 in Rosenberg. You should expect an average low temperature of 20°F in the coldest months of winter.

Since the USDA zone info for Rosenberg is not always accurate the actual date of last frost changes from year to year. Since half of the time in Rosenberg there is a last frost after February 15 be ready to cover your borage if you have one of those late frosts.

USDA Zone Info for Rosenberg

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in Rosenberg

You may be interested in your other planting guides for Rosenberg.