Bar Harbor, ME Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Bar Harbor, Maine.
Gardening in Bar Harbor
Acadia's gateway community has a maritime climate moderated by the Gulf of Maine. The combination of ocean mildness and rocky terrain creates unique growing conditions.
Zone 5b with 144 frost-free days. The ocean moderation keeps Bar Harbor milder than inland Maine. Rocky, acidic soil grows native blueberries magnificently. Garden space is limited by terrain.
Acadia National Park's wild landscapes contrast with the cultivated gardens of Bar Harbor's historic estates. The island community grows food with the resourcefulness that maritime living requires.
What This Means for Bar Harbor Gardeners
The average last spring frost in Bar Harbor is around May 10, and the average first fall frost arrives around October 1. That gives you approximately 144 frost-free days to work with.
At 144 days, you're working with a compressed but productive window. Choose varieties by their days-to-maturity number — anything under 75 days is safe, 75-90 requires indoor starting, and 90+ is a calculated risk. The tradeoff: your cool, moderate summers are excellent for crops that heat-zone gardeners struggle with. Your lettuce doesn't bolt in June. Your peas produce for weeks longer. Cool-season crops are your superpower.
These dates are based on NOAA 30-year Climate Normal data for the Bar Harbor area. Your actual frost dates could shift 2-3 weeks in either direction in any given year. Learn more about our data sources.
What to Grow in Bar Harbor
With 144 frost-free days, Bar Harbor gardeners need to plan strategically — start warm-season crops indoors and choose short-season varieties. Cool-season crops are your strength, thriving in the moderate temperatures that define your growing window. Recommended starting points: kale, lettuce, peas, carrots, potatoes, radishes, garlic, and short-season tomatoes.
See the full Maine planting guide for all 40 plants: Maine Planting Calendar. Or enter your zip code for exact planting dates personalized to Bar Harbor.
More About Zone 5B
Bar Harbor is in USDA Hardiness Zone 5B, which means average annual extreme minimum temperatures between -15°F to -10°F. View the full Zone 5B planting guide.
See the complete planting calendar for Maine: Maine Planting Calendar.
Other Cities in Maine
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Bar Harbor area. They represent historical averages, not predictions. In any given year, the actual last frost could be 2-3 weeks earlier or later. Microclimates within Bar Harbor (urban heat islands, hilltops, low-lying valleys) can also shift your local frost dates by a week or more.
Start everything possible indoors — your 144-day season doesn't leave room for a slow start. Direct sow only the fastest, hardiest crops (radishes, lettuce, peas) 3-4 weeks before last frost (May 10). Choose short-season varieties for warm crops. Enter your zip code for exact dates.