Before planting it is a good idea to find your USDA Zone info to estimate 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.

You can determine when you can plant oxalis in Costa Mesa by reviewing the USDA zone info.

Planting Calendar for Oxalis

Frost tolerance for oxalis:	Not tolerant of frost.
When to plant:	After the last frost has passed.

You really shouldn't plant oxalis until after the last frost has passed because they require warm weather.

The earliest that you can plant oxalis in Costa Mesa 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 oxalis and expect a good harvest is probably September. If you wait any later than that and your oxalis may not have a chance to really do well. You can get started a little bit earlier by starting your oxalis indoors.

Last Frost Date

In Costa Mesa the average date of last frost happens on January 31. In the coldest months of winter you should expect an average low temperature of 35°F.

Remember that USDA zone info for Costa Mesa is not always accurate and the actual date of last frost can change quite a bit from year to year. Since half of the time in Costa Mesa you get a frost after January 31 be ready to protect your oxalis if you have a surprise late frost.

USDA Zone Info for Costa Mesa

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 Costa Mesa

You may be interested in your other planting guides for Costa Mesa.