Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By referring to the USDA zone info for Portsmouth you will be able to estimate when it's the best time to plant indian cress.

Planting Calendar for Indian cress

Frost tolerance for indian cress:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Since indian cress are not cold tolerant you really should wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant indian cress in Portsmouth is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant indian cress and expect a good harvest is probably August. Any later than that and your indian cress may not have a chance to really do well. You can get started a few weeks earlier by starting your indian cress indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Portsmouth. You should expect an average low temperature of -10°F in the coldest months of winter.

It's important to remember that the actual date of last frost is an average because it is based on the USDA zone info for Portsmouth and it can change quite a bit from year to year. Half of the time in Portsmouth last frost occurs after April 15 so be sure to be ready to cover your indian cress in the event of 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.