The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You can estimate when to plant diascia in Zone 1a by using the USDA zone info.

Planting Calendar for Diascia

Frost tolerance for diascia:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since diascia are moderately cold tolerant you can plant them a little bit earlier in the year than other plants that might not handle the cold.

The earliest that you can plant diascia 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 diascia and expect a good harvest is probably July. If you wait any later than that and your diascia may not have a chance to really do well. You can get started a few weeks earlier by starting your diascia indoors.

Last Frost Date

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

Remember that the actual date of last frost is not always accurate because it is based on the USDA zone info for Zone 1a and it will vary from year to year. Half of the time in Zone 1a last frost occurs after June 15 so always be ready to protect your diascia in the event of 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.