One of the first steps you take when you are making a decision about your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

One way of getting a good idea when to plant calla lily is to look at the USDA zone info for Grafton.

Planting Calendar for Calla Lily

Frost tolerance for calla lily:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

It's not a good idea to plant calla lily until after the last frost when the weather gets warmer because they do not do well in cold weather.

The earliest that you can plant calla lily in Grafton 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 calla lily and expect a good harvest is probably August. You probably don't want to wait any later than that or else your calla lily may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your calla lily indoors.

Last Frost Date

The average date of last frost is April 15 in Grafton. It might get as low as -15°F during the coldest months of winter.

Always keep in mind that USDA zone info for Grafton is just an average and the actual date of last frost changes from year to year. Half of the time in Grafton last frost occurs after April 15 so always be ready to cover your calla lily if you have a surprise late frost.

USDA Zone Info for Grafton

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 Grafton

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