When to plant Collard greens in Maine
In spring, from Mar 10 – June 1 in Auburn to May 1 – June 1 in Sanford.
In fall, from June 15 – July 15 in Bangor to July 15 – Aug 15 in Lewiston.
Dates are for setting out plants. USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Auburn | Mar 10 – June 1 | July 15 – Aug 15 |
| Augusta | Apr 1 – June 1 | July 15 – Aug 15 |
| Bangor | Apr 1 – June 1 | June 15 – July 15 |
| Biddeford | Apr 15 – June 1 | June 15 – July 15 |
| Lewiston | Mar 10 – June 1 | July 15 – Aug 15 |
| Portland | Apr 1 – June 1 | July 1 – Aug 1 |
| Saco | Apr 1 – June 1 | July 1 – Aug 1 |
| Sanford | May 1 – June 1 | June 15 – July 15 |
| South Portland | Apr 1 – June 1 | July 1 – Aug 1 |
| Waterville | Apr 1 – June 1 | July 1 – Aug 1 |
| Westbrook | Apr 1 – June 1 | July 1 – Aug 1 |
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. The full USDA table for collards.