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.

By using the USDA zone info for Zone 1a you should be able to estimate when you can plant angel's trumpets.

Planting Calendar for Angel's Trumpets

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

You can plant angel's trumpets a bit earlier in the year because they are one of those plants that can tolerate a tiny bit of cold weather.

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

Last Frost Date

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

It's important to remember that the actual date of last frost is an average because it is based on the USDA zone info for Zone 1a and it changes from year to year. Half of the time in Zone 1a there is a last frost after June 15 so be sure to be ready to cover your angel's trumpets if you have a surprise 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.