When can I plant Oenothera in Zone 1a

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

By looking at the USDA zone info for Zone 1a it's possible to figure out when it's a good idea to plant oenothera.


Planting Calendar for Oenothera

Frost tolerance for oenothera: Tolerant of some frost.
When you should plant them: Up to 5 weeks before last frost.

Oenothera do well in moderate cold which tells us that you can plant them just a bit earlier in the year than other frost tender plants.

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

The earliest that you can plant oenothera 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 oenothera and expect a good harvest is probably July. Any later than that and your oenothera may not have a chance to fully mature. You can get started a few weeks earlier by starting your oenothera indoors.

Last Frost Date

On average the last frost when the weather gets warmer 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 our actual date of last frost is not always accurate because it is based on the USDA zone info for Zone 1a and it is different every year. Since half of the time in Zone 1a there is a last frost after June 15 be ready to cover your oenothera 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 our other planting guides for Zone 1a.