One of the best tools that you have as gardeners to help us figure out your 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 your area.

You should be able to figure out when it's possible to plant kohlrabi by checking out the USDA zone info for Longmont.

Planting Calendar for Kohlrabi

Frost tolerance for kohlrabi:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Kohlrabi do ok in mild cold which tells us that you can plant them a little bit earlier in the year than more sensitive plants.

The earliest that you can plant kohlrabi in Longmont 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 kohlrabi and expect a good harvest is probably September. You probably don't want to wait any later than that or else your kohlrabi may not have a chance to grow to maturity. If you are starting your kohlrabi indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Longmont. It might get as low as -15°F during the coldest months of winter.

It's important to remember that USDA zone info for Longmont may not be accurate from year to year and the actual date of last frost changes from year to year. Half of the time in Longmont there is a last frost after April 15 so make sure that you are ready to protect your kohlrabi if you have one of those late frosts.

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.