The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By checking out the USDA zone info for Boulder it's possible to estimate when to plant garden orache.

Planting Calendar for Garden Orache

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

You can plant garden orache just a bit earlier in the year because they are one of those plants that can tolerate a little bit of cold weather.

The earliest that you can plant garden orache in Boulder 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 garden orache and expect a good harvest is probably September. You probably don't want to wait any later than that or else your garden orache may not have a chance to fully mature. You can get started a little bit earlier by starting your garden orache indoors.

Last Frost Date

On average the last frost is on April 15 in Boulder. It might get as low as -15°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Boulder may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Half of the time in Boulder you get a frost after April 15 so just be sure to be ready to protect your garden orache if you have one of those late frosts.

USDA Zone Info for Boulder

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 Boulder

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