One of the first steps you take when you are estimating 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.

By looking at the USDA zone info for Houghton it's a good idea to determine when it's possible to plant calla lily.

Planting Calendar for Calla Lily

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

You can not plant calla lily until after the last frost has passed because they do not do well in cold weather.

The earliest that you can plant calla lily in Houghton 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 really do well. You can get started a little bit earlier by starting your calla lily indoors.

Last Frost Date

The average date of last frost is April 15 in Houghton. In the coldest months of winter you should expect an average low temperature of -15°F.

Remember that USDA zone info for Houghton is just an average and the actual date of last frost is different every year. Half of the time in Houghton it frosts late in the year after April 15 so be sure to be ready to cover your calla lily if you have one of those late frosts.

USDA Zone Info for Houghton

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 Houghton

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