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.

The earliest that you can plant lenten rose in Zone 1a can be determined by referring to the USDA zone info.

Planting Calendar for Lenten Rose

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

You can plant lenten rose a bit earlier in the year because they are moderately cold tolerant.

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

Last Frost Date

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

Remember that USDA zone info for Zone 1a may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Zone 1a it frosts late in the year after June 15 so be sure to be ready to protect your lenten rose in the event of 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.