One of the first steps you take when you are getting a good idea your gardening schedule is find your 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 4a it's a good idea to determine when to plant lenten rose.

Planting Calendar for Lenten Rose

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

Lenten Rose can survive in mild cold which means that you can plant them a little earlier in the year than other frost tender plants.

The earliest that you can plant lenten rose in Zone 4a is March. However, you really should wait until April 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 August. If you wait any later than that and your lenten rose may not have a chance to grow to maturity. If you are starting your lenten rose indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average the last frost is on May 15 in Zone 4a. In the coldest months of winter you can expect an average low temperature of -30°F.

Remember that USDA zone info for Zone 4a is not always accurate and the actual date of last frost changes from year to year. Half of the time in Zone 4a there is a last frost after May 15 so make sure that you are prepared to protect your lenten rose if you have a surprise late frost.

USDA Zone Info for Zone 4a

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Zone 4a

You may be interested in your other planting guides for Zone 4a.