One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You will be able to determine when it's the best time to plant cosmos by referring to the USDA zone info for Los Alamitos.

Planting Calendar for Cosmos

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

Cosmos do ok in a tiny bit of cold which tells us that you can plant them slightly earlier in the year than other plants that might not handle the cold.

The earliest that you can plant cosmos in Los Alamitos 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 cosmos and expect a good harvest is probably September. If you wait any later than that and your cosmos may not have a chance to grow to maturity. Starting your cosmos indoors is a great way to get them started a little bit earlier.

Last Frost Date

In Los Alamitos the average date of last frost happens on January 31. It might get as low as 35°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Los Alamitos is just an average and the actual date of last frost changes from year to year. Since half of the time in Los Alamitos there is a last frost after January 31 be ready to protect your cosmos if you have a late frost.

USDA Zone Info for Los Alamitos

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 Los Alamitos

You may be interested in your other planting guides for Los Alamitos.