One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

It's possible to figure out when it's the best time to plant alyssum by looking at the USDA zone info for Zone 1a.

Planting Calendar for Alyssum

Frost tolerance for alyssum:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Alyssum can survive in quite a bit of cold which means that you can plant them earlier in the year than more sensitive plants.

The earliest that you can plant alyssum in Zone 1a 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 alyssum and expect a good harvest is probably July. If you wait any later than that and your alyssum may not have a chance to really do well. If you are starting your alyssum indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

The average date of last frost is June 15 in Zone 1a. It might get as low as -60°F during the coldest months of winter.

Always keep in mind that USDA zone info for Zone 1a is not always accurate and the actual date of last frost is different every year. Half of the time in Zone 1a you get surprised by a frost after June 15 so be sure to be ready to protect your alyssum if you have one of those late frosts.

USDA Zone Info for Zone 1a

Here is the info for USDA Zone 1a.

Average Date of Last Frost (spring)	June 15
Average Date of First Frost (fall)	July 15
Lowest Expected Low	-60°F
Highest Expected Low	-55°F

This means that on a really cold year, the coldest it will get is -60°F. On most years you should be prepared to experience lows near -55°F.

Plants to Grow in Zone 1a

You may be interested in your other planting guides for Zone 1a.