When can I plant Lobelia in Zone 2a

One of the first steps we take when we are determining our gardening schedule is find our USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for our area.

You can estimate when it's possible to plant lobelia in Zone 2a by looking at the USDA zone info.


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 are very cold tolerant which tells us that you can plant them a quite a bit earlier than more sensitive plants.

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 2a 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 lobelia and expect a good harvest is probably August. 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 little bit earlier by starting your lobelia indoors.

Last Frost Date

The average date of last frost is May 15 in Zone 2a. It might get as low as -50°F during the coldest months of winter.

Remember that USDA zone info for Zone 2a is an average and our actual date of last frost can change quite a bit from year to year. Half of the time in Zone 2a there is a last frost after May 15 so make sure that you are prepared to protect your lobelia if we have one of those late frosts.

USDA Zone Info for Zone 2a

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 Zone 2a

You may be interested in our other planting guides for Zone 2a.