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.

In Boulder you can estimate when you can plant baby blue eyes by referring to the USDA zone info.

Planting Calendar for Baby Blue Eyes

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

You can plant baby blue eyes a little earlier in the year because they do well in moderate cold.

The earliest that you can plant baby blue eyes 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 baby blue eyes and expect a good harvest is probably September. You probably don't want to wait any later than that or else your baby blue eyes may not have a chance to really do well. Starting your baby blue eyes indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

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

Since the USDA zone info for Boulder is an average the actual date of last frost will vary from year to year. Half of the time in Boulder you get a frost after April 15 so be sure to be ready to cover your baby blue eyes in the event of a surprise late frost.

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.