One of the first steps you take when you are estimating your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

One way of estimating when it's the best time to plant tree onions is to check out the USDA zone info for Carpinteria.

Planting Calendar for Tree onions

Frost tolerance for tree onions:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

You can plant tree onions a bit earlier in the year because they are one of those plants that can tolerate a tiny bit of cold weather.

The earliest that you can plant tree onions in Carpinteria is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant tree onions and expect a good harvest is probably September. You probably don't want to wait any later than that or else your tree onions may not have a chance to fully mature. You can get started a few weeks earlier by starting your tree onions indoors.

Last Frost Date

On average the last frost is on January 31 in Carpinteria. In the coldest months of winter you should expect an average low temperature of 30°F.

Since the USDA zone info for Carpinteria is an average the actual date of last frost can change quite a bit from year to year. Half of the time in Carpinteria it frosts late in the year after January 31 so just be sure to be ready to protect your tree onions in the event of a surprise late frost.

USDA Zone Info for Carpinteria

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 Carpinteria

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