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

In Imperial you can figure out when you can plant lupine by referring to the USDA zone info.

Planting Calendar for Lupine

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

You can plant lupine a bit earlier in the year because they are moderately cold tolerant.

The earliest that you can plant lupine in Imperial 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 lupine and expect a good harvest is probably October. You probably don't want to wait any later than that or else your lupine may not have a chance to fully mature. Starting your lupine indoors is a great way to get them started a little bit earlier.

Last Frost Date

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

Keep in mind that USDA zone info for Imperial is not always accurate and the actual date of last frost changes from year to year. Half of the time in Imperial it frosts late in the year after January 31 so always be ready to cover your lupine if you have a surprise late frost.

USDA Zone Info for Imperial

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 Imperial

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