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When to Plant Bittercress in Portsmouth, NH

One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The first opportunity to plant bittercress in Portsmouth can be estimated by checking out the USDA zone info.


Planting Calendar for Bittercress

Frost tolerance for bittercress: Tolerant of a very small amount of frost.
When to plant: Up to 3 weeks before last frost.

Since bittercress are one of those plants that can tolerate a tiny bit of cold weather you can plant them just a tiny bit earlier in the year than other plants that might not handle the cold.

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

The earliest that you can plant bittercress in Portsmouth 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 bittercress and expect a good harvest is probably August. You probably don't want to wait any later than that or else your bittercress may not have a chance to really do well. You can get started a few weeks earlier by starting your bittercress indoors.

Last Frost Date

In Portsmouth the average date of last frost happens on April 15. In the coldest months of winter you should expect an average low temperature of -10°F.

Always keep in mind that the actual date of last frost is just an average because it is based on the USDA zone info for Portsmouth and it will vary from year to year. Since half of the time in Portsmouth there is a last frost after April 15 be ready to cover your bittercress if you have a surprise late frost.

USDA Zone Info for Portsmouth

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)April 15
Average Date of First Frost (fall)October 15
Lowest Expected Low-10°F
Highest Expected Low-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Portsmouth

You may be interested in your other planting guides for Portsmouth.