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

It's a good idea to determine when it's possible to plant axilflower by referring to the USDA zone info for Boulder.

Planting Calendar for Axilflower

Frost tolerance for axilflower:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

Since axilflower do not do well in cold weather you must wait until after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant axilflower in Boulder 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 axilflower and expect a good harvest is probably August. If you wait any later than that and your axilflower may not have a chance to really do well. If you are starting your axilflower 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 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 not always accurate the actual date of last frost will vary from year to year. Since half of the time in Boulder you get a frost after April 15 be ready to cover your axilflower 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.