When to Plant Cabbage in Maine (2026 Guide)

When it comes to growing cabbage in Maine, timing is crucial. Cabbage thrives in cool temperatures, making it ideal for planting in early spring or late summer. For those in Zone 5b, the median last spring frost date is May 8, while Zone 6a enjoys an earlier date of April 27. Understanding these frost dates is essential for successful cabbage cultivation.

Cabbage can be planted as a spring crop, ideally to harvest before the heat of summer sets in, or as a fall crop, to enjoy after summer's heat has passed. In Maine, this means carefully timing your planting to align with frost dates and the unique growing conditions in your area. Those in Portland, for example, should take advantage of the longer growing season offered by the slightly warmer Zone 6a.

Given the variable weather conditions in Maine, including late spring snows and occasional humidity, it's vital to prepare for any surprises. Using modern varieties that mature at different rates can help ensure a successful harvest, whether you're aiming for summer salads or winter storage. Make sure you're equipped with knowledge about your local climate and planting best practices to get the most out of your cabbage crops.

Planting Schedule by USDA Zone in Maine

Zone	Indoor start	Transplant out	Direct sow	Harvest
Zone 5b	Start March 15 – March 29, ~6–8 weeks before May 8	Transplant outdoors May 15 – May 29, after the last frost	Direct sow outdoors May 15 – June 1, after the last frost	Harvest from July 20 – October 5, before the first frost
Zone 6a	Start March 1 – March 15, ~6–8 weeks before April 27	Transplant outdoors April 30 – May 14, after the last frost	Direct sow outdoors April 30 – May 15, after the last frost	Harvest from June 20 – October 8, before the first frost

Cabbage Planting Windows in Maine

Indoor start: For cabbage in Maine, start your seeds indoors between March 1 and March 29 for optimal results.
Transplant outdoors: Transplant your cabbage seedlings outdoors between April 30 and May 29 to avoid late spring frosts.
Harvest: Expect to harvest cabbage between June 20 and October 8, making sure to gather them before the first frost date.

Common Mistakes Growing Cabbage in Maine

Many beginners in Maine assume they can plant cabbage too late in the spring without considering local frost dates. It's critical to remember dates like May 8 for Zone 5b to avoid loss of your young plants.
Underestimating the impact of humidity can lead to pest issues, such as aphids and cabbage worms, which thrive in moist conditions. Regularly check your crops and use preventative measures to protect your cabbage from invasion.
In coastal areas of Maine, fog can delay your garden's warming, impacting seed germination and growth. Choose planting dates that align with the local microclimate to better foster healthy cabbage growth.
Some growers in Maine forget the importance of soil pH, which is vital for preventing clubroot disease. Testing your soil before planting cabbage and amending it to achieve a pH of 6.5–7.0 can prevent serious crop loss.
Failing to rotate crops every three years is a common mistake in Maine gardening. Clubroot diseases can accumulate in the soil if cabbage or other brassicas are planted in the same location consecutively, leading to diminished yields.

Frequently Asked Questions

What if I'm in a cold pocket of Maine?

If you're located in a colder pocket, be extra cautious with frost dates. You may want to start your seeds indoors a few weeks earlier to give them a jumpstart before transplanting.

Can I still plant cabbage in May?

Yes, you can plant cabbage in May, especially if you're in Zone 5b, but make sure to do so after the last frost date of May 8 to ensure the seedlings are not damaged.

How can I prevent slugs from attacking my cabbage?

To prevent slugs, use slug bait or copper tape around your young plants. Additionally, consider setting up beer traps that can effectively draw and eliminate these pests before they cause significant damage.

When is the best time to harvest my cabbage?

The ideal time to harvest cabbage is from June 20 through October 8. Make sure to check for the size and firm texture of the heads to determine the right moment for picking.

How do I choose the right cabbage variety for my garden?

Select a variety based on the length of your growing season and your intended use. For Maine, consider early-maturing types for a quick summer harvest or storage varieties for winter use.