Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A way of estimating when it's a good idea to plant red cabbage is to consult the USDA zone info for Ontario.

Planting Calendar for Red cabbage

Frost tolerance for red cabbage:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

You can plant red cabbage much earlier in the year because they do well in cold.

The earliest that you can plant red cabbage in Ontario 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 red cabbage and expect a good harvest is probably October. You probably don't want to wait any later than that or else your red cabbage may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your red cabbage indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on January 31 in Ontario. In the coldest months of winter you can expect an average low temperature of 30°F.

Remember that USDA zone info for Ontario is just an average and the actual date of last frost will vary from year to year. Since half of the time in Ontario it frosts late in the year after January 31 be ready to cover your red cabbage if you have a surprise late frost.

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.