Gas prices in St. Catharines and Niagara
In St. Catharines and Niagara, regular averaged 174.4¢/L at the October 19, 2026 survey, and the estimate for October 27, 2026 is 171.1¢/L.
Regular gasoline in St. Catharines and Niagara, survey of Monday, October 19, 2026
174.4¢/L
Estimate for tomorrow, Tuesday, October 27, 2026: 171.1¢/L (−3.3¢).
| 55 L at this price | $95.92 |
| The same fill-up tomorrow (estimate) | $94.11 |
| Fuel for 15,000 km a year | $2,233 |
| Taxes in one litre | 29.1¢/L (16.7%) |
| Past error of the estimate | ±2.3¢ on average over 140 weeks ("no change" guess: ±3.7¢) |
Source: Government of Ontario, survey of Monday, October 19, 2026.
Prepared by Radif Partners · Method · official sources read on October 26, 2026 · estimate for October 27, 2026, published method
The Government of Ontario surveys St. Catharines as its own market every Monday, and the figure stands for the Niagara area around it. At the survey of Monday, October 19, 2026, regular gasoline there averaged 174.4¢/L, premium 204.1¢/L and diesel 257.9¢/L, taxes included, which made Niagara number 2 from the cheapest of the 5 Ontario cities on this site with a surveyed market of their own. Over the last 13 surveys, the regular price moved by 4.7¢/L a week on average. For October 27, 2026 the site estimates 171.1¢/L, adding to Monday's price the pre-tax change in the Régie de l'énergie du Québec's daily Montreal survey with HST; replayed on 140 weeks, the method missed by 2.3¢/L on average, a no-change guess by 3.7¢/L. Taxes, Ontario's 9 cents a litre plus 13% HST with the federal excise suspended since April 20, 2026, are 16.7% of the price.
One market for the Niagara Peninsula
The province's weekly survey has a market called St. Catharines, and it is the only one of its markets on the Niagara Peninsula. This page uses it for the whole area and labels it St. Catharines and Niagara. Each figure in the table is dated and attributed; the estimate column is what the method expects for October 27, 2026.
| Fuel | Latest official figure | Date and source | Estimate for October 27, 2026 | Past error of the method |
|---|---|---|---|---|
| Regular gasoline | 174.4¢/L | survey of Monday, October 19, 2026 · Government of Ontario | 171.1¢/L | ±2.3¢ on average over 140 weeks ("no change" guess: ±3.7¢) |
| Premium gasoline | 204.1¢/L | survey of Monday, October 19, 2026 · Government of Ontario | 200.8¢/L | ±2.4¢ on average over 140 weeks ("no change" guess: ±3.8¢) |
| Diesel | 257.9¢/L | survey of Monday, October 19, 2026 · Government of Ontario | 255.9¢/L | ±3.6¢ on average over 140 weeks ("no change" guess: ±3.7¢) |
How much the price moves in a week
A weekly survey hides how much ground the price covers between two Mondays. The published series shows it after the fact. Across the last 12 weekly changes, the average move in either direction was 4.7¢/L; the sharpest rise was +7.4¢ and the sharpest fall −8.1¢.
| Survey | Regular | Change on the week |
|---|---|---|
| October 19, 2026 | 174.4¢/L | −4.2¢ |
| October 13, 2026 | 178.6¢/L | −3.1¢ |
| October 5, 2026 | 181.7¢/L | +2.9¢ |
| September 28, 2026 | 178.8¢/L | −0.2¢ |
| September 21, 2026 | 179.0¢/L | +0.1¢ |
| September 14, 2026 | 178.9¢/L | −5.0¢ |
| September 8, 2026 | 183.9¢/L | +5.2¢ |
| August 31, 2026 | 178.7¢/L | +5.8¢ |
| August 24, 2026 | 172.9¢/L | +7.4¢ |
| August 17, 2026 | 165.5¢/L | +6.5¢ |
| August 10, 2026 | 159.0¢/L | −7.8¢ |
| August 3, 2026 | 166.8¢/L | −8.1¢ |
Those swings set the bar for any estimate. Repeating last Monday's price would have missed by 3.7¢/L on average over 140 weeks; the method used here, which follows the eastern wholesale market each day through the Québec survey, brought that down to 2.3¢/L. That is good enough to tell whether the price is heading up or down, not to predict the posted price at a given station.
Tomorrow in St. Catharines and Niagara
Estimate for tomorrow, Tuesday, October 27, 2026, St. Catharines and Niagara
171.1¢/L
| Official starting point | 174.4¢/L (survey of Monday, October 19, 2026) |
| Wholesale price, up to October 21, 2026, with sales tax | −3.3¢ |
| Past error of the method | ±2.3¢ on average over 140 weeks ("no change" guess: ±3.7¢) |
Niagara among Ontario cities
Ranked by the latest Monday survey, Niagara was number 2 from the cheapest of the 5 Ontario cities on this site with their own surveyed market. The order shifts often, as the weekly changes above suggest.
Ontario cities by price
Cheapest, regular gasoline
Ottawa
| Gap between the two | +6.2¢ |
| On a 55 L fill-up | $3.41 |
| Cities compared | 5 |
For a closer neighbour, the Hamilton page compares this market with the southern Ontario average week by week, and the Toronto page covers the two halves of the Greater Toronto Area.
Fill-ups, premium and diesel in Niagara
In money terms, a weekly move of 4.7¢/L is worth $2.58 on a 55-litre fill-up, and the largest rise in the series $4.07. At the survey price the full 55 litres of regular cost $95.92; a 90-litre pickup tank of diesel, $232.11. Premium was 29.7¢/L above regular and diesel 83.5¢/L above it. Niagara sits on the border with New York State, but this site does not publish US prices; a comparison across the river needs a currency and a gallon conversion and has to count the bridge toll.
Your fill-up in Niagara
Cost of the fill-up
$81.53
| 10 litres | $17.44 |
| If the price goes up 5¢ | $83.87 |
| If the price goes down 5¢ | $79.19 |
| Each cent per litre on this fill-up | $0.47 |
What is tax in a Niagara litre
Every Ontario litre carries 9 cents of provincial gasoline tax and HST at 13% on the full price; Niagara has no extra local fuel tax. The breakdown at the latest survey:
| Component | Per litre |
|---|---|
| Ontario gasoline tax | 9.00¢/L |
| Federal excise tax | 0.00¢/L |
| Sales tax (HST, 13%) | 20.06¢/L |
| Refined product, transport and margins | 145.34¢/L |
| Pump price | 174.4¢/L |
The last Niagara surveys with diesel
| Survey | Regular | Diesel |
|---|---|---|
| October 19, 2026 | 174.4¢/L | 257.9¢/L |
| October 13, 2026 | 178.6¢/L | 255.7¢/L |
| October 5, 2026 | 181.7¢/L | 250.2¢/L |
| September 28, 2026 | 178.8¢/L | 254.6¢/L |
| September 21, 2026 | 179.0¢/L | 259.6¢/L |
| September 14, 2026 | 178.9¢/L | 250.1¢/L |
| September 8, 2026 | 183.9¢/L | 235.6¢/L |
| August 31, 2026 | 178.7¢/L | 221.1¢/L |
| August 24, 2026 | 172.9¢/L | 226.6¢/L |
| August 17, 2026 | 165.5¢/L | 220.2¢/L |
| August 10, 2026 | 159.0¢/L | 208.6¢/L |
| August 3, 2026 | 166.8¢/L | 216.2¢/L |
| July 27, 2026 | 174.9¢/L | 218.2¢/L |
The national ranking places this market among all Canadian cities covered.