How to Grow Sweet Potatoes Canada
On this page
In Canada, sweet potatoes planted out late March to early April, and are ready to harvest 100–150 days after sowing.
Timing is the decision that matters most in Canada: there are 6 separate regional planting out windows, ranging from late March in Pacific Coastal Mild to mid June in Far North & Alpine.
The short answer
- Plant out
- Late March to early April
- Ready in
- 100–150 days
- Site
- 6+ hours of sun, soil pH 5–7
- Biggest risk
- Sweetpotato black rot
Core growing advice on this page is checked against named horticultural sources — see References.
Sweet Potato (Ipomoea batatas)
9 sources cited · Verified
Regional Planting Calendar
| Region | Plant out |
|---|---|
| Pacific Coastal Mild derived | late March to early April |
| Central Continental derived | early May to late May |
| Inland Valleys & Southern Lakes derived | early May to late May |
| Atlantic Maritime derived | mid May to late May |
| Prairies & Short-Season Continental derived | late May to mid June |
| Far North & Alpine derived | mid June to late June |
Rows marked derived are interpolated between regions our sources do state, because no source we consulted gives a figure for that region specifically. They are deliberately wider to reflect that uncertainty.
Pacific Coastal Mild - detail & sources
DERIVED from this region's own frost normal, not quoted for the region. RHS: plant out slips at least 30cm apart in late spring or early summer, once all frost risk has passed, needing 21-26°C to thrive -- in most of Canada this means growing under cover for all or part of the season regardless of the frost-clearance date. Applied to a mean last frost of 18 March (NOAA NCEI 1991-2020 for the USA; Environment and Climate Change Canada normals for Canada), that gives 25 March to 8 April. Your own local frost date is what matters — a region spans a range, and this figure comes from one representative station within it.
Central Continental - detail & sources
DERIVED from this region's own frost normal, not quoted for the region. RHS: plant out slips at least 30cm apart in late spring or early summer, once all frost risk has passed, needing 21-26°C to thrive -- in most of Canada this means growing under cover for all or part of the season regardless of the frost-clearance date. Applied to a mean last frost of 30 April (NOAA NCEI 1991-2020 for the USA; Environment and Climate Change Canada normals for Canada), that gives 7 May to 21 May. Your own local frost date is what matters — a region spans a range, and this figure comes from one representative station within it.
Inland Valleys & Southern Lakes - detail & sources
DERIVED from this region's own frost normal, not quoted for the region. RHS: plant out slips at least 30cm apart in late spring or early summer, once all frost risk has passed, needing 21-26°C to thrive -- in most of Canada this means growing under cover for all or part of the season regardless of the frost-clearance date. Applied to a mean last frost of 30 April (NOAA NCEI 1991-2020 for the USA; Environment and Climate Change Canada normals for Canada), that gives 7 May to 21 May. Your own local frost date is what matters — a region spans a range, and this figure comes from one representative station within it.
Atlantic Maritime - detail & sources
DERIVED from this region's own frost normal, not quoted for the region. RHS: plant out slips at least 30cm apart in late spring or early summer, once all frost risk has passed, needing 21-26°C to thrive -- in most of Canada this means growing under cover for all or part of the season regardless of the frost-clearance date. Applied to a mean last frost of 7 May (NOAA NCEI 1991-2020 for the USA; Environment and Climate Change Canada normals for Canada), that gives 14 May to 28 May. Your own local frost date is what matters — a region spans a range, and this figure comes from one representative station within it.
Prairies & Short-Season Continental - detail & sources
DERIVED from this region's own frost normal, not quoted for the region. RHS: plant out slips at least 30cm apart in late spring or early summer, once all frost risk has passed, needing 21-26°C to thrive -- in most of Canada this means growing under cover for all or part of the season regardless of the frost-clearance date. Applied to a mean last frost of 21 May (NOAA NCEI 1991-2020 for the USA; Environment and Climate Change Canada normals for Canada), that gives 28 May to 11 June. Your own local frost date is what matters — a region spans a range, and this figure comes from one representative station within it.
Far North & Alpine - detail & sources
DERIVED from this region's own frost normal, not quoted for the region. RHS: plant out slips at least 30cm apart in late spring or early summer, once all frost risk has passed, needing 21-26°C to thrive -- in most of Canada this means growing under cover for all or part of the season regardless of the frost-clearance date. Applied to a mean last frost of 5 June (NOAA NCEI 1991-2020 for the USA; Environment and Climate Change Canada normals for Canada), that gives 12 June to 26 June. Your own local frost date is what matters — a region spans a range, and this figure comes from one representative station within it.
Quick Facts
| Factor | Value |
|---|---|
| Soil pH | 5 - 7 |
| Sunlight | 6-6 hours direct sun |
| Germination temp | 24°C |
| Optimal growing temp | 18-28°C |
| Minimum survivable temp | 1°C |
| Time to harvest | 100-150 days |
| Drainage | Moisture-retentive, free-draining |
| Lifecycle | perennial |
| Edible parts | storage roots |
At a Glance
Soil & Growing Conditions
Soil pH range
Span reflects genuine variation between the cited authorities, not a single agreed figure.
Growth Stages
| Stage | BBCH | Notes |
|---|---|---|
| Slips & establishment | 0 | Grown from rooted cuttings ("slips") rather than seed tubers, available from online veg plant suppliers from late April. Pot up and grow on under cover until frost risk has passed. RHS. |
| Planting out | 3 | Plant out at least 30cm apart in late spring or early summer, once all frost risk has passed. RHS. |
| Vining growth | 6 | Trailing or climbing stems easily reach 1.5m or more in length as the plant bulks up through summer, well before any sign of the tubers developing below. RHS. |
| Harvest & curing | 8 | Most varieties need at least four to five months from planting; "Bonita" takes about 100 days. Harvest once the leaves yellow and die back in early autumn, before any frost -- tip the plant out of its container or lift with a fork. Dry tubers in warm sunshine for a few days to improve storage, though they generally keep for only a few weeks. RHS. |
Harvest & Storage
When to pick: RHS: "Bonita" takes "about 100 days from planting slips to harvesting"; most varieties require "at least four to five months"; harvest "once the leaves turn yellow and die back in early autumn, before any frost". UMD: days to maturity "85 to 120"; check root size "after 80 to 85 days because they don't stop growing"; roots "can start to split when overgrown"; harvest "before a frost".
Storage
Cure and store in cool, dry conditions for long-term keeping
Diseases
Pests
Nutrient Issues
Sweet Potato, Slip to Harvest
Plan your Sweet Potatoes planting
When to sow and plant Sweet Potatoes depends on your own frost dates. Check the Canada vegetable planting calendar. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.
Growing Sweet Potato in another region
Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.
Sources
The full list of 9 sources behind this guide (Clemson Cooperative Extension, FAO EcoCrop, GBIF and others) is in the references of our UK guide to sweet potatoes; they describe the plant itself, which is the same wherever it grows.
Frequently Asked Questions
When should I plant sweet potatoes out in Canada?
In Pacific Coastal Mild, from late March. In Far North & Alpine, wait until mid June. Treat these as a guide rather than a fixed date — the governing rule is to plant out only once frost risk has passed and temperatures are reliably warm enough.
How long do sweet potatoes take to grow?
Typically 100–150 days, depending on cultivar and growing conditions.
What soil pH do sweet potatoes need?
A pH of about 5–7. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.
What problems affect sweet potatoes?
Our data links 2 diseases and 2 pests to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
Short-season growing is arithmetic before it is technique: days to maturity against frost-free days decides what will finish at all. The Canada Garden Planner does that subtraction for your region before you sow.
Get the Canada Garden Planner →Instant PDF download · Written for Canadian growing conditions
How this guide is put together
The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against Canadian hardiness-zone and frost-date data, with provincial agriculture and university extension sources cited directly where one exists for a crop. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.
Vegetable Growing Guides Canada
Last verified 2026-09-02
Where To Go From Here
Take this crop from reading into a written plan for your own beds.
Keep going
Plan the next step
Use the printable SoilCommander planner for your region to turn this guide into sowing dates, bed layouts and weekly garden tasks.