What Can Grow in Portland, ME

Portland's coastal Maine location has a moderated climate warmer than inland areas — excellent for cold-hardy crops.

Portland, ME is in USDA Hardiness Zone 5b. The growing season lasts about 148 days, with last frost around April 25 and first fall frost around October 20. Top crops include tomatoes, kale, broccoli.

5bUSDA Zone
148 daysFrost-Free
April 25Last Frost
October 20First Frost
🌱 What Grows in Portland
tomatoeskalebroccolipotatoesbeansbeets
💡 Planting Tips

Coastal moderation extends season. Wild blueberries nearby. Start seeds early March.

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📍 Full Zone 5b Guide 🌎 Maine Planting Guide

Frequently Asked Questions

Portland, ME is in USDA Plant Hardiness Zone 5b. Portland's coastal Maine location has a moderated climate warmer than inland areas — excellent for cold-hardy crops.

The average last spring frost in Portland is around April 25. The first fall frost typically arrives around October 20, giving a frost-free growing season of approximately 148 days.

Portland's Zone 5b climate supports growing tomatoes, kale, broccoli, potatoes, beans, beets. Coastal moderation extends season. Wild blueberries nearby. Start seeds early March.

In Portland, start with cool-season crops like lettuce, spinach, and broccoli a few weeks before the last frost date of April 25. Warm-season crops like tomatoes and peppers should go in after all frost risk has passed.