Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

It's a good idea to determine when it's a good idea to plant euphorbia by looking at the USDA zone info for Zone 1a.

Planting Calendar for Euphorbia

Frost tolerance for euphorbia:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Euphorbia do ok in very little cold which tells us that you can plant them slightly earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant euphorbia in Zone 1a is June. However, you really should wait until July if you don't want to take any chances.

The last month that you can plant euphorbia and expect a good harvest is probably July. You probably don't want to wait any later than that or else your euphorbia may not have a chance to really do well. You can get started a couple of weeks earlier by starting your euphorbia indoors.

Last Frost Date

In Zone 1a the average date of last frost happens on June 15. In the coldest months of winter you should expect an average low temperature of -60°F.

Since the USDA zone info for Zone 1a is just an average the actual date of last frost changes from year to year. Since half of the time in Zone 1a it frosts late in the year after June 15 be ready to cover your euphorbia if you have a late frost.

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.