When can I plant Tithonia in Zone 1a

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

In Zone 1a you can figure out when it's a good idea to plant tithonia by reviewing the USDA zone info.


Planting Calendar for Tithonia

Frost tolerance for tithonia: Not tolerant of frost.
When you should plant them: After the last frost has passed.

It's not a good idea to plant tithonia until after the last frost has passed because they require warm weather.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant tithonia
Possibly ok, but a risky time to plant tithonia
Probably not a good time to plant tithonia

The earliest that you can plant tithonia in Zone 1a is June. However, you really should wait until July if you don't want to take any chances.

The last month that you can plant tithonia and expect a good harvest is probably July. If you wait any later than that and your tithonia may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your tithonia indoors.

Last Frost Date

In Zone 1a the average date of last frost happens on June 15. We can expect an average low temperature of -60°F in the coldest months of winter.

Since the USDA zone info for Zone 1a may not be accurate from year to year our actual date of last frost can change quite a bit from year to year. Since half of the time in Zone 1a we get a frost after June 15 be ready to protect your tithonia if we have a late frost.

USDA Zone Info for Zone 1a

Here is the info for USDA Zone 1a.

Average Date of Last Frost (spring)June 15
Average Date of First Frost (fall)July 15
Lowest Expected Low-60°F
Highest Expected Low-55°F

This means that on a really cold year, the coldest it will get is -60°F. On most years you should be prepared to experience lows near -55°F.

Plants to Grow in Zone 1a

You may be interested in our other planting guides for Zone 1a.