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.

A way of determining when it's a good idea to plant corn salad is to look at the USDA zone info for Ontario.

Planting Calendar for Corn salad

Frost tolerance for corn salad:	Not tolerant of frost.
When to plant:	After the last frost.

You really shouldn't plant corn salad until after the last frost when the weather gets warmer because they are not cold tolerant.

The earliest that you can plant corn salad in Ontario 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 corn salad and expect a good harvest is probably September. Any later than that and your corn salad may not have a chance to fully mature. If you are starting your corn salad indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average the last frost has passed is on January 31 in Ontario. You can expect an average low temperature of 30°F in the coldest months of winter.

Just be sure to remember that the actual date of last frost is not always accurate because it is based on the USDA zone info for Ontario and it changes from year to year. Since half of the time in Ontario there is a last frost after January 31 be ready to protect your corn salad in the event of one of those late frosts.

USDA Zone Info for Ontario

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 Ontario

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