One of the first steps you take when you are estimating your gardening schedule is find your 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.

In Boulder you can determine when you can plant baby's breath by reviewing the USDA zone info.

Planting Calendar for Baby's Breath

Frost tolerance for baby's breath:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

You can plant baby's breath a little 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 baby's breath 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's breath and expect a good harvest is probably September. You probably don't want to wait any later than that or else your baby's breath may not have a chance to fully mature. Starting your baby's breath indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Boulder. You can expect an average low temperature of -15°F in the coldest months of winter.

Since the USDA zone info for Boulder is an average the actual date of last frost is different every year. Half of the time in Boulder last frost occurs after April 15 so make sure that you are prepared to cover your baby's breath in the event of a 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.