The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

It's possible to determine when it's possible to plant browallia by referring to the USDA zone info for Markham.

Planting Calendar for Browallia

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

It's a bad idea to plant browallia until after the last frost has passed because they are not cold tolerant.

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

Last Frost Date

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

Just be sure to remember that USDA zone info for Markham is just an average and the actual date of last frost will vary from year to year. Half of the time in Markham there is a last frost after April 15 so make sure that you are prepared to protect your browallia in the event of a late frost.

USDA Zone Info for Markham

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Markham

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