When can I plant Erysimum in Zone 5b

One of the best tools that we have as gardeners to help us determine our 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 our area.

By reviewing the USDA zone info for Zone 5b you should be able to estimate when it's the best time to plant erysimum.


Planting Calendar for Erysimum

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

Since erysimum are moderately cold tolerant you can plant them a little earlier in the year than plants that are more sensitive to the cold.

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

The earliest that you can plant erysimum in Zone 5b is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant erysimum and expect a good harvest is probably September. If you wait any later than that and your erysimum may not have a chance to fully mature. You can get started a little bit earlier by starting your erysimum indoors.

Last Frost Date

The average date of last frost is April 15 in Zone 5b. In the coldest months of winter we should expect an average low temperature of -15°F.

Always keep in mind that USDA zone info for Zone 5b is not always accurate and our actual date of last frost will vary from year to year. Half of the time in Zone 5b we get surprised by a frost after April 15 so just be sure to be ready to cover your erysimum if we have a surprise late frost.

USDA Zone Info for Zone 5b

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)April 15
Average Date of First Frost (fall)October 15
Lowest Expected Low-15°F
Highest Expected Low-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Zone 5b

You may be interested in our other planting guides for Zone 5b.