The 2018-S Apostle Islands Quarter value ranges from $0.25 for circulated copper-nickel versions to over $45 for high-grade silver proof specimens. Most coins found in your change are face value, but specific “S” mint marks and proof finishes can command a significant premium among collectors and enthusiasts today.

Coin Version	Condition / Grade	Estimated Value
2018-S Clad Business Strike	Uncirculated (MS65)	$2.00 – $5.00
2018-S Clad Proof	Proof (PR69)	$6.00 – $10.00
2018-S Silver Proof	Proof (PR70)	$35.00 – $55.00

Understanding the 2018-S Apostle Islands Quarter

The Apostle Islands quarter is part of the “America the Beautiful” (ATB) series, a long-running program that honored national parks and historic sites across the United States. This specific design features the majestic sea caves of Wisconsin’s Apostle Islands National Lakeshore, showing a kayaker paddling through the iconic rock formations.

Finding a coin with an “S” mint mark is quite different from finding the common “P” (Philadelphia) or “D” (Denver) quarters. If you are unsure what you have in your pocket, using a top coin identifier app can help you distinguish between a standard circulation coin and a special San Francisco strike.

The 2018-S is unique because the San Francisco Mint produced three distinct types for this design: the Business Strike (made for collectors but intended for sale in rolls), the Clad Proof, and the Silver Proof. Unlike the coins made in Philly or Denver, these were not officially released into general circulation, though they do occasionally find their way into piggy banks. Many users of CoinKnow have reported finding these “NIFC” (Not Intended For Circulation) coins in high-quality condition.

Comparing Clad vs. Silver 2018-S Apostle Islands Values

The composition of your quarter is the biggest factor in determining its market price. The standard “clad” version is made of a copper-nickel alloy, while the silver version consists of 90% silver. If you have a silver version, it carries “intrinsic value” based on its precious metal content, regardless of its condition.

Silver proof quarters are typically sold in special sets by the US Mint. These coins have a mirrors-like finish and highly detailed frosting on the design elements. Because of their silver content, the current market prices for silver ATB quarters remain consistently higher than their copper-nickel counterparts.

Collectors often look for “Deep Cameo” (DCAM) finishes on these 2018-S coins. A silver proof graded at a perfect PR70 DCAM can easily fetch $50 or more. If you aren’t sure if your coin is silver, check the edge; a silver coin will have a solid white/silver edge, while a clad coin will show a distinct copper stripe.

Metal Composition	Mintage (Approx.)	High-End Value
Copper-Nickel (Clad)	850,000+	$15.00 (MS67)
90% Silver	390,000+	$60.00 (PR70)

The Business Strike: 2018-S Quarters in Circulation

You might be surprised to find a 2018-S Apostle Islands quarter in your change. This is usually a “Business Strike” (MS) coin. While the Denver and Philadelphia mints produced hundreds of millions of these coins, the San Francisco Mint struck only about 800,000 to 900,000 for specific collector bags and rolls.

Because these were sold at a premium by the Mint, they are much rarer than the common versions. If you find one that looks shiny and new, it could be worth between $2 and $5. Most people don’t realize that a simple “S” mark on a non-shiny coin still indicates a low-mintage item.

To get an accurate estimate of what your specific find is worth, checking comprehensive 2018 quarter value data is essential. Collectors prioritize “Eye Appeal,” so if your San Francisco strike has heavy scratches or fingerprints, it may only be worth a small amount over its face value.

Grading and Its Impact on Price

When professional collectors talk about value, they use a 1 to 70 scale. For the 2018-S Apostle Islands Quarter, the difference between a grade of 65 and 69 can be dozens of dollars. Most “Business Strike” S-mint coins found in public will grade around AU58 (About Uncirculated) or MS63.

Proof coins are graded using the “PR” prefix. Since these are handled with extreme care at the mint, many survive in PR68 or PR69 condition. However, a “Perfect 70” is the holy grail. A 2018-S Silver Proof Apostle Islands quarter in a PCGS or NGC Slab graded PR70 is a prize for any ATB series collector.

You can use the CoinKnow app to photograph your coin and see how its visual condition compares to known graded examples. This helps you decide if it is worth spending the money to have the coin professionally graded by a third-party service.

Grade	Clad Value	Silver Value
MS63 / PR63	$1.50	$12.00
MS65 / PR65	$3.00	$18.50
MS67 / PR69	$12.00	$25.00
PR70 (Deep Cameo)	$22.00	$55.00

Collecting the 2018 America the Beautiful Series

The Apostle Islands quarter was the second of five designs released in 2018. The other parks featured that year included Pictured Rocks (Michigan), Voyageurs (Minnesota), Cumberland Island (Georgia), and Block Island (Rhode Island). The Apostle Islands design is often cited as a favorite due to the intricate detail of the cliffs.

Many collectors try to assemble “Mint Sets” including P, D, and S mint marks for each design. If you have the full 2018 set in S-mint business strikes, the value is higher as a package than as individual coins. Keeping these in a protective folder or flip is the best way to maintain their luster.

Using tools like CoinKnow can help you track which coins you’ve found and which ones you still need to complete your 2018 collection. Because the Apostle Islands 2018-S has a relatively low mintage compared to the 1999 Delaware or other early state quarters, they are considered “modern keys” for the ATB series.

Common Errors to Look For

While no major, high-value “variety” has been discovered for the 2018-S Apostle Islands quarter yet, error hunters always keep a sharp eye out. Common modern errors include “Die Chips” or “Machine Doubling.” Die chips on the sea caves or the kayaker’s paddle might add a small $5-$10 premium to a curious buyer.

Doubled Die Obverse (DDO) or Reverse (DDR) errors are the most sought after. If you see clear, distinct doubling in the letters of “LIBERTY” or the details of the rocks, you could be holding a very rare coin. Always inspect your 2018-S closely under a magnifying glass or a digital microscope.

Even without a major error, the 2018-S Apostle Islands quarter remains a valuable piece of American numismatic history. Whether it’s the silver version saved for its metal or a clad business strike found in a roll, it represents a beautiful part of the Wisconsin landscape and a limited production run from the San Francisco Mint.

FAQ

Q: How can I tell if my 2018-S Apostle Islands quarter is silver?

A: Check the edge of the coin. If you see a solid silvery-white color with no trace of copper/orange, it is likely the 90% silver proof version. You can also weigh it; a silver quarter weighs 6.25 grams, while a clad quarter weighs 5.67 grams.

Q: Why is the “S” mint mark important?

A: The “S” stands for the San Francisco Mint. Unlike the “P” and “D” mints, which make coins for the public to spend, the San Francisco Mint typically only makes coins for collectors in limited quantities. This lower supply usually leads to higher demand and higher prices.

Q: Is a 2018-S Apostle Islands quarter worth getting graded?

A: Generally, it is only worth professional grading (which costs $20-$50) if the coin is in “Perfect” PR70 condition or if it is a Silver Proof. Common clad versions found in circulation are usually not worth the grading fees unless they have a significant error.

Q: Where can I sell my 2018-S Quarter?

A: You can sell these at local coin shops, through online marketplaces like eBay, or at coin shows. For the highest price, ensure the coin is protected in a plastic holder to prevent scratches.

Q: What is the mintage of the 2018-S Apostle Islands Business Strike?

A: The mintage for the 2018-S Clad Business Strike was 916,240. This is extremely low compared to the tens of millions of P and D quarters minted the same year, making it a “semi-key” date for collectors.