What hardiness zone is Prince Edward Island?

Prince Edward Island is Zone 5b to Zone 6a, and because it's a small, low, flat island completely surrounded by the warm waters of the Gulf of St. Lawrence and Northumberland Strait, its hardiness zone is unusually uniform. Charlottetown and the sheltered Northumberland Strait (south) side are Zone 6a; the more wind-exposed north shore facing the Gulf runs a touch cooler at Zone 5b. The surrounding water keeps PEI's winters mild for its latitude and its summers cool, so it's a mild-winter, cool-summer, moist maritime climate. Zones are assigned by Natural Resources Canada from winter minimum plus summer heat, rainfall, snow cover, wind, and frost-free days, so a Canadian zone is not identical to the U.S. (USDA) zone of the same number. Check your exact location at planthardiness.gc.ca.

What is PEI's growing zone?

PEI's growing zone is essentially Zone 5b–6a across the whole island — one of the more uniform provinces because it is small, flat, and ocean-surrounded. Charlottetown and the south (Northumberland Strait) side are Zone 6a; the north shore is nearer Zone 5b. The island's famous rich red soil, mild winters, and reliable moisture make it excellent for potatoes (its signature crop), other roots, brassicas, and berries. Confirm your own area on the NRCan map, but across PEI the zone doesn't swing the way it does in bigger, more varied provinces.

What planting zone is Charlottetown?

Charlottetown is Zone 6a. On the sheltered Northumberland Strait side of the island, it has PEI's mild-winter, cool-summer maritime climate: an average last spring frost around mid-May and a first fall frost in mid-October, giving a long frost-free season, with modest summer heat. Choose perennials, shrubs, and trees rated Zone 6 or hardier, and take advantage of the long, cool, moist season for cool-season vegetables, potatoes, and tree fruit, while giving heat-lovers like tomatoes a warm, sheltered spot.

Is all of PEI the same hardiness zone?

Nearly — and that's what makes PEI unusual. Because the island is small, low-lying, and wrapped by relatively warm sea water, the hardiness zone barely changes from end to end: most of PEI is Zone 5b to 6a. The sheltered south and central areas (including Charlottetown) sit at Zone 6a, while the Gulf-facing north shore, more exposed to wind, is closer to Zone 5b. There are no cold interior mountains or continental extremes to create the two- and three-zone swings you see in New Brunswick or Newfoundland. Still, check your exact spot on the NRCan map, since an exposed shoreline reads a little cooler than a sheltered inland garden.

How do I find my exact hardiness zone on PEI?

Three ways, most precise first: (1) Use the official Natural Resources Canada Plant Hardiness Zone Map at planthardiness.gc.ca — enter your address or postal code for a location-specific zone. (2) Use our interactive Zone Finder (growersguide.ca/zone-finder) — click Prince Edward Island for the island's zones and Charlottetown frost dates. (3) Take Charlottetown (Zone 6a) as the island reference and shade a little cooler on the exposed north shore. Because PEI is so uniform, the nearest-city method works better here than in most provinces — the main local variables are wind exposure and a sheltered versus open site.

Are Canadian hardiness zones the same as USDA zones?

No. The USDA system is based on winter minimum temperature alone. Natural Resources Canada's system factors in seven variables — winter minimum, summer maximum, frost-free period, rainfall, snow cover, and wind — so a Canadian 'Zone 6' is defined differently from a USDA 'Zone 6,' even though the numbers look the same. On PEI, mild ocean-moderated winters could suggest a warm zone, but cool maritime summers pull the overall rating back. NRCan does also publish a separate USDA-method map for cross-border comparison. Practical rule: use the Canadian (NRCan) zone from planthardiness.gc.ca for Canadian-sourced plants and Maritime seed catalogues, and treat a U.S. plant tag's zone as a rough guide only.

What can I grow on Prince Edward Island?

PEI's mild-winter, cool-summer, moist climate and rich soil suit a wide range. Potatoes are the island's signature crop, and other roots (carrots, beets, parsnips), brassicas, leeks, onions, and salad greens thrive in the cool, reliable conditions. Berries do very well — strawberries and blueberries especially. Tree fruit like hardy apples and plums grow in sheltered spots. Heat-loving crops (tomatoes, peppers, corn) succeed with a warm, sheltered site and a little help against cool summers. For ornamentals, Zone 6 (Zone 5 on the exposed north shore) perennials, shrubs, and hardy roses are reliable. Use your frost dates for vegetable timing.

PRINCE EDWARD ISLAND PLANT HARDINESS ZONES

Prince Edward Island Hardiness Zones — Zone by Region

Prince Edward Island's hardiness zones are ocean-moderated and unusually uniform — about Zone 5b to 6a island-wide, warmest around Charlottetown and the Northumberland Strait. Find PEI's plant zone, frost dates, and growing-season length.

Updated July 2026 · Natural Resources Canada Plant Hardiness Zone Map + Environment and Climate Change Canada normals (1991–2020)

Prince Edward Island hardiness zones: small, flat, and ocean-surrounded, PEI is unusually uniform — about Zone 5b to 6a island-wide. Charlottetown and the sheltered Northumberland Strait side are Zone 6a; the wind-exposed Gulf-facing north shore runs nearer Zone 5b. The surrounding water keeps winters mild and summers cool. Zones come from Natural Resources Canada and are not identical to U.S. (USDA) zones. Find your exact zone at planthardiness.gc.ca or with our Zone Finder.

🍁 PEI Zones at a Glance

Island reference

Charlottetown

Zone 6a

North shore

Zone 5b

Gulf-facing, wind-exposed

Frost-free season

157 days

Charlottetown average

PEI Frost Dates & Zone (Charlottetown)

Charlottetown is the island's long-record reference station in our dataset (Environment and Climate Change Canada normals + Natural Resources Canada zone). Because PEI is so uniform, these figures are a good guide for most of the island, shading a little cooler on the exposed north shore.

City	Zone	Last Frost	First Frost	Season
Charlottetown ›	6a	May 10	Oct 14	157 days

Frost dates are historical averages; actual dates vary year to year, so add 1–2 weeks of buffer before transplanting frost-sensitive crops. Exposed north-shore sites read a little cooler than sheltered Charlottetown.

What Zone Is My PEI Town?

PEI's zone barely changes across the island, so the answer is close to Zone 6a for the sheltered south and centre and Zone 5b for the exposed north shore. Charlottetown carries its exact Natural Resources Canada zone; for other areas we give the band and point you to the NRCan map. For a pinpoint answer, check your address at planthardiness.gc.ca or our Zone Finder.

What zone is Charlottetown?

Zone 6a

The sheltered Northumberland Strait side — the island reference: mild winters, cool summers, a long frost-free season.

Find Charlottetown on the Zone Finder ›

What zone is Summerside & the centre?

Zone 6a

Central and southern PEI — sheltered, close to the Charlottetown reading. A solid Zone 6a for most planting.

Find your town on the Zone Finder ›

What zone is the north shore?

Zone 5b

The Gulf-facing north coast (toward Cavendish, Tignish) — more wind-exposed and a touch cooler; treat as Zone 5b.

Find your area on the Zone Finder ›

PEI's Zones, Warmest to Coolest

Zone 6a — Charlottetown, the south & centre. The sheltered Northumberland Strait side and the island's interior. Mild winters, cool moist summers, rich red potato soil — most of PEI.

Zone 5b — the Gulf-facing north shore. The wind-exposed north coast toward Cavendish and Tignish — a touch cooler and windier than the sheltered south. Shelter borderline plants from the sea wind.

The whole-island story. PEI has no cold interior or high ground to create big swings, so the zone stays in the 5b–6a band from tip to tip — one of the most uniform provinces in Canada. Wind exposure, not latitude, is the main local variable.

Why PEI Zones Aren't the Same as U.S. Zones

If you're buying plants or reading growing advice from American sources, don't take a USDA zone at face value. The U.S. system is based on winter minimum temperature alone. Natural Resources Canada's system factors in seven variables — winter minimum, summer maximum, frost-free period, rainfall, snow cover, and wind — so a Canadian "Zone 6" is defined differently from a USDA "Zone 6." On PEI, mild ocean-moderated winters would suggest a warm zone, but cool maritime summers pull the rating back.

Practical rule for PEI: use the Canadian (NRCan) zone from planthardiness.gc.ca for Canadian-sourced plants and Maritime seed catalogues, and treat a U.S. plant tag's zone as a rough guide only. On the exposed north shore, pick the hardier (lower-numbered) option.

Source & how to cite: Zone assignments follow the Natural Resources Canada Plant Hardiness Zone Map (planthardiness.gc.ca); frost dates are Environment and Climate Change Canada climate normals (1991–2020). Enter your address on the NRCan map for a location-specific zone.

PEI City Planting Guides

Your zone tells you what survives the winter; these guides tell you exactly what to sow and transplant, week by week.

Charlottetown Planting Guide ›
Zone 6a · last frost May 10

🍁 Hardiness Zones Across Canada

Ontario →Zones 3b–7a — Windsor to Thunder Bay Quebec →Zones 4b–5b — St. Lawrence valley British Columbia →Zones 4a–9a — Canada’s widest range Alberta →Zones 3b–4b — chinook + elevation Saskatchewan →Zones 2b–3b — Prairie continental Manitoba →Zones 1b–3b — Red River valley Nova Scotia →Zones 5b–6b — ocean-moderated Maritime New Brunswick →Zones 4–6a — Fundy coast to the north Newfoundland & Labrador →Zones 4b–6 island; 0–3 Labrador 📍 Find Your Exact Zone →Interactive map + zones-by-city lookup for any Canadian town

Find your exact zone & what to plant now

Click your province on the interactive map, or jump straight to your city's frost-based planting timeline.

🗺️ Interactive Zone Finder 🌱 What to Plant Now ❄️ Frost Date Calculator

Prince Edward Island Hardiness Zones — Zone by Region

🍁 PEI Zones at a Glance

PEI Frost Dates & Zone (Charlottetown)

What Zone Is My PEI Town?

What zone is Charlottetown?

What zone is Summerside & the centre?

What zone is the north shore?

PEI's Zones, Warmest to Coolest

Why PEI Zones Aren't the Same as U.S. Zones

PEI City Planting Guides

🍁 Hardiness Zones Across Canada

Find your exact zone & what to plant now

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