When can I plant Spearmint in Zone 3b

One of the best tools that we have as gardeners to help us estimate 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.

You will be able to figure out when you can plant spearmint by referring to the USDA zone info for Zone 3b.


Planting Calendar for Spearmint

Frost tolerance for spearmint: Very tolerant of frost.
When you should plant them: Up to 7 weeks before last frost.

Spearmint do ok in cold weather which tells us that you can plant them earlier in the year than other plants that might not handle the cold.

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

The earliest that you can plant spearmint in Zone 3b 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 spearmint and expect a good harvest is probably August. Any later than that and your spearmint may not have a chance to grow to maturity. Starting your spearmint indoors is a great way to get them started a little bit earlier.

Last Frost Date

In Zone 3b the average date of last frost happens on May 15. We should expect an average low temperature of -35°F in the coldest months of winter.

Just be sure to remember that USDA zone info for Zone 3b is just an average and our actual date of last frost changes from year to year. Since half of the time in Zone 3b we get surprised by a frost after May 15 be ready to cover your spearmint in the event of one of those late frosts.

USDA Zone Info for Zone 3b

Here is the info for USDA Zone 3b.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)September 15
Lowest Expected Low-35°F
Highest Expected Low-30°F

This means that on a really cold year, the coldest it will get is -35°F. On most years you should be prepared to experience lows near -30°F.

Plants to Grow in Zone 3b

You may be interested in our other planting guides for Zone 3b.