Keystone
South Dakota
Keystone Gas Prices - Find the Lowest Gas Prices in Keystone, SD
Search for the lowest gasoline prices in Keystone, SD. Find local Keystone gas prices and Keystone gas stations with the best prices to fill up at the pump today
National and South Dakota Gas Price Averages
| National Avg. | SD Reg. Avg. | SD Plus Avg. | SD Prem. Avg. | SD Diesel Avg. |
|---|---|---|---|---|
|
$3.160
11/29/2025
|
$2.986
11/29/2025
|
$3.195
11/29/2025
|
$3.638
11/29/2025
|
$3.399
11/29/2025
|
Today's lowest gas prices in South Dakota and around Keystone
| Station | Regular | Plus | Premium | Diesel |
|---|---|---|---|---|
Freedom 615 9th St SE, Watertown, SD |
$2.32
11/29/2025
|
11/29/2025
|
11/29/2025
|
11/29/2025
|
Freedom 220 10th St SW, Watertown, SD |
$2.32
11/29/2025
|
11/29/2025
|
11/29/2025
|
11/29/2025
|
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Local Events
Kris Kringle Craft and Vendor Fair
Saturday, Nov 29, 2025 from 9:00am to 3:00pm
Hill City, SD
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Angel Bazaar Craft & Holiday Fair
Saturday, Dec 6, 2025 from 8:00am to 2:00pm
Rapid City, SD
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In and Around Keystone, SD