One of the best tools that you have as gardeners to help us determine your 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 your area.

The USDA zone info for Alamosa can be reviewed to figure out 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 all chance of frost has passed.

It's probably not a good idea to plant calla lily until after the last frost has passed because they require warm weather.

The earliest that you can plant calla lily in Alamosa 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. If you wait any later than that and your calla lily may not have a chance to grow to maturity. You can get started a little bit earlier by starting your calla lily indoors.

Last Frost Date

The average date of last frost is May 15 in Alamosa. It might get as low as -25°F during the coldest months of winter.

Since the USDA zone info for Alamosa is just an average the actual date of last frost will vary from year to year. Half of the time in Alamosa it frosts late in the year after May 15 so make sure that you are ready to protect your calla lily in the event of a late frost.

USDA Zone Info for Alamosa

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 Alamosa

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