The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The first opportunity to plant tritoma in Zone 1b should be figured out by using the USDA zone info.

Planting Calendar for Tritoma

Frost tolerance for tritoma:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Tritoma can survive in quite a bit of cold which means that you can plant them a lot earlier in the year than other frost tender plants.

The earliest that you can plant tritoma in Zone 1b 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 tritoma and expect a good harvest is probably July. Any later than that and your tritoma may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your tritoma indoors.

Last Frost Date

In Zone 1b the average date of last frost happens on June 15. You can expect an average low temperature of -55°F in the coldest months of winter.

Remember that USDA zone info for Zone 1b may not be accurate from year to year and the actual date of last frost is different every year. Half of the time in Zone 1b last frost occurs after June 15 so make sure that you are prepared to protect your tritoma if you have a late frost.

USDA Zone Info for Zone 1b

Here is the info for USDA Zone 1b.

Average Date of Last Frost (spring)	June 15
Average Date of First Frost (fall)	July 15
Lowest Expected Low	-55°F
Highest Expected Low	-50°F

This means that on a really cold year, the coldest it will get is -55°F. On most years you should be prepared to experience lows near -50°F.

Plants to Grow in Zone 1b

You may be interested in your other planting guides for Zone 1b.