Canning Altitude Adjustments for Canada
Canadian altitudes affect canning times because water boils at a lower temperature as elevation rises. Bernardin and Health Canada publish four altitude bands for water-bath canning: 0–305 m, 305–610 m, 610–1220 m, and 1220 m and above. Add the band-specific extra time published in your edition of Bernardin to the base processing time printed in the recipe. For pressure canning, increase the pressure (PSI), not the time.
Why altitude matters in Canadian canning
Water boils at 100 °C at sea level. At Calgary’s 1,045 m, it boils closer to 96 °C. At Banff’s 1,383 m, lower still. That difference is small but it’s enough to change how long heat needs to do its work in a sealed jar.
For water-bath canning of high-acid foods, the time published in a recipe assumes you’re at sea level. Your altitude adds minutes on top of that base time.
For pressure canning of low-acid foods, the published time stays the same — but the pressure (PSI) goes up. The pressure is what gets the contents above 100 °C; you need more of it the higher you live.
Always consult Bernardin or Health Canada for the exact additions and PSI steps. The bands below describe the structure — your edition has the numbers.
Canadian altitude bands (water-bath canning)
Bernardin and Health Canada group Canadian elevations into four bands. The base recipe applies in the lowest band; each higher band adds time:
| Band | Elevation (metric) | Elevation (imperial) | Action |
|---|---|---|---|
| 1 | 0 – 305 m | 0 – 1,000 ft | Use base time |
| 2 | 305 – 610 m | 1,000 – 2,000 ft | Add Bernardin Band 2 increment |
| 3 | 610 – 1,220 m | 2,000 – 4,000 ft | Add Bernardin Band 3 increment |
| 4 | 1,220 m + | 4,000 ft + | Add Bernardin Band 4 increment |
The actual minute-add per band varies by recipe and food. Look it up — never guess.
Where Canadian cities fall
| City | Elevation | Band |
|---|---|---|
| Halifax | 145 m | 1 |
| St. John’s | ~45 m | 1 |
| Charlottetown | ~50 m | 1 |
| Montréal | 36 m | 1 |
| Québec City | 98 m | 1 |
| Ottawa | 70 m | 1 |
| Toronto | 76 m | 1 |
| Winnipeg | 239 m | 1 |
| Saskatoon | 481 m | 2 |
| Regina | 577 m | 2 |
| Edmonton | 668 m | 3 |
| Kelowna | 344 m | 2 |
| Vancouver | 0 – 70 m | 1 |
| Victoria | ~23 m | 1 |
| Calgary | 1,045 m | 3 |
| Banff | 1,383 m | 4 |
| Whitehorse | 706 m | 3 |
| Yellowknife | 206 m | 1 |
If you’re between bands, always round up to the higher band. Over-processing slightly is safe; under-processing is not.
Pressure canning: change the PSI, not the time
For a dial-gauge canner, Bernardin publishes a PSI step at each altitude band. A weighted-gauge canner uses two settings (typically 10 lbs and 15 lbs); above the lower band, you switch to the higher setting.
Open your Bernardin edition and use the PSI table — don’t carry over numbers from US sources, because Canadian elevations and the band cut-offs differ.
How to use this with our calculator
Our canning-times calculator is structured around exactly these four metric bands. As we verify each food’s processing times against the latest Bernardin edition, we add it to the lookup table. Until a time is verified, the calculator deliberately shows a “pending verification” message rather than a number — that’s the food-safety contract.
What never changes
- Headspace. Whatever the recipe says (usually 1 cm / ½ inch for jams and pickles, 2 cm / ¾ inch for tomatoes and fruit in syrup).
- Acidification rule. For tomatoes water-bath canned: 1 tbsp bottled lemon juice per 500 mL, 2 tbsp per 1 L. Bernardin and Health Canada agree on this. Altitude does not change this number.
- Jar size. A recipe written for 500 mL jars cannot be moved into 1 L jars without re-checking the time. Always match the jar size the recipe specifies.
Altitude adjustment only ever changes minutes (water-bath) or pressure (pressure canning). Everything else holds.
Sources
- Bernardin Complete Book of Home Preserving (latest edition)
- Health Canada — Home Food Preservation guidance