The USDA Zone info is a great tool for gardeners to help us estimate 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.

One way of getting a good idea when to plant flower-of-an-hour is to refer to the USDA zone info for Fairbanks.

Planting Calendar for Flower-of-an-Hour

Frost tolerance for flower-of-an-hour:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Flower-of-an-Hour do ok in mild cold which tells us that you can plant them just a tiny bit earlier in the year than more sensitive plants.

The earliest that you can plant flower-of-an-hour in Fairbanks is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant flower-of-an-hour and expect a good harvest is probably August. Any later than that and your flower-of-an-hour may not have a chance to really do well. If you are starting your flower-of-an-hour indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

In Fairbanks the average date of last frost happens on May 15. You should expect an average low temperature of -50°F in the coldest months of winter.

Remember that the actual date of last frost is an average because it is based on the USDA zone info for Fairbanks and it can change quite a bit from year to year. Since half of the time in Fairbanks you get surprised by a frost after May 15 be ready to cover your flower-of-an-hour if you have one of those late frosts.

USDA Zone Info for Fairbanks

Here is the info for USDA Zone 2a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	August 15
Lowest Expected Low	-50°F
Highest Expected Low	-45°F

This means that on a really cold year, the coldest it will get is -50°F. On most years you should be prepared to experience lows near -45°F.

Plants to Grow in Fairbanks

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