One of the first steps you take when you are estimating your gardening schedule is find your 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 should be able to determine when to plant pentas by looking at the USDA zone info for Toronto.

Planting Calendar for Pentas

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

It's not a good idea to plant pentas until after all chance of frost has passed because they require warm weather.

The earliest that you can plant pentas in Toronto 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 pentas and expect a good harvest is probably August. Any later than that and your pentas may not have a chance to really do well. You can get started a little bit earlier by starting your pentas indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Toronto. 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 Toronto is just an average and the actual date of last frost changes from year to year. Since half of the time in Toronto there is a last frost after April 15 be ready to protect your pentas if you have one of those late frosts.

USDA Zone Info for Toronto

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 Toronto

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