Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. 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 you can plant tomatos is to check out the USDA zone info for Ontario.

Planting Calendar for Tomatos

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

Tomatos require warm weather which tells us that you need to wait until it warms up after all chance of frost has passed before you can plant them.

The earliest that you can plant tomatos in Ontario is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant tomatos and expect a good harvest is probably August. If you wait any later than that and your tomatos may not have a chance to really do well. You can get started a couple of weeks earlier by starting your tomatos indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Ontario. In the coldest months of winter you can expect an average low temperature of -5°F.

It's important to remember that USDA zone info for Ontario is an average and the actual date of last frost changes from year to year. Since half of the time in Ontario you get surprised by a frost after April 15 be ready to protect your tomatos in the event of a late frost.

USDA Zone Info for Ontario

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Ontario

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