When can I plant Lobelia in Zone 1a

Before planting it is a good idea to find our USDA Zone info to estimate our garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for our area.

You should be able to determine when it's possible to plant lobelia by using the USDA zone info for Zone 1a.


Planting Calendar for Lobelia

Frost tolerance for lobelia: Very tolerant of frost.
When you should plant them: Up to 7 weeks before last frost.

Lobelia do well in cold weather which means that you can plant them earlier in the year than plants that are more sensitive to the cold.

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

The earliest that you can plant lobelia in Zone 1a 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 lobelia and expect a good harvest is probably July. You probably don't want to wait any later than that or else your lobelia may not have a chance to really do well. You can get started a couple of weeks earlier by starting your lobelia indoors.

Last Frost Date

The average date of last frost is June 15 in Zone 1a. We should 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 is different every year. Half of the time in Zone 1a we get a frost after June 15 so just be sure to be ready to protect your lobelia in the event of 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.