When to Plant Calendula in Zone 1a

One of the first steps you take when you are determining 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.

The USDA zone info for Zone 1a can be read to estimate when it's the best time to plant calendula.


Planting Calendar for Calendula

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

Since calendula are moderately cold tolerant you can plant them just a bit earlier in the year than more sensitive plants.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant calendula
Possibly ok, but a risky time to plant calendula
Probably not a good time to plant calendula

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

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 you get surprised by a frost after June 15 so make sure that you are ready to protect your calendula 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.