Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A common way of getting a good idea when it's the best time to plant snow-in summer is to use the USDA zone info for Holtville.

Planting Calendar for Snow-in Summer

Frost tolerance for snow-in summer:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Snow-in Summer are moderately cold tolerant which tells us that you can get them planted earlier than other plants that might not handle the cold.

The earliest that you can plant snow-in summer in Holtville 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 snow-in summer and expect a good harvest is probably October. You probably don't want to wait any later than that or else your snow-in summer may not have a chance to really do well. Starting your snow-in summer indoors is a great way to get them started a little bit earlier.

Last Frost Date

In Holtville the average date of last frost happens on January 31. It might get as low as 30°F during the coldest months of winter.

Since the USDA zone info for Holtville is not always accurate the actual date of last frost will vary from year to year. Half of the time in Holtville last frost occurs after January 31 so just be sure to be ready to protect your snow-in summer in the event of one of those late frosts.

USDA Zone Info for Holtville

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 Holtville

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