The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You should be able to figure out when it's possible to plant indian cress by looking at the USDA zone info for Longmont.

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.

It's a bad idea to plant indian cress until after the last frost has passed because they do not do well in cold weather.

The earliest that you can plant indian cress in Longmont 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. You probably don't want to wait any later than that or else your indian cress may not have a chance to grow to maturity. If you are starting your indian cress indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average the last frost has passed is on April 15 in Longmont. In the coldest months of winter you can expect an average low temperature of -15°F.

Just be sure to remember that USDA zone info for Longmont is an average and the actual date of last frost changes from year to year. Half of the time in Longmont last frost occurs after April 15 so always be ready to protect your indian cress if you have a surprise late frost.

USDA Zone Info for Longmont

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 Longmont

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