When can I plant Calla Lily in Zone 4b

One of the best tools that we have as gardeners to help us estimate our gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for our area.

The USDA zone info for Zone 4b should be reffered to in order to estimate when it's the best time to plant calla lily.


Planting Calendar for Calla Lily

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

Since calla lily do not do well in cold weather you need to wait until after the last frost when the weather gets warmer before you can plant them.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant calla lily
Possibly ok, but a risky time to plant calla lily
Probably not a good time to plant calla lily

The earliest that you can plant calla lily in Zone 4b is May. However, you really should wait until June 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 grow to maturity. If you are starting your calla lily indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

The average date of last frost is May 15 in Zone 4b. We should expect an average low temperature of -25°F in the coldest months of winter.

Just be sure to remember that our actual date of last frost is an average because it is based on the USDA zone info for Zone 4b and it changes from year to year. Half of the time in Zone 4b it frosts late in the year after May 15 so make sure that you are ready to protect your calla lily if we have a late frost.

USDA Zone Info for Zone 4b

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-25°F
Highest Expected Low-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Zone 4b

You may be interested in our other planting guides for Zone 4b.