The 2006-S Colorado State Quarter is worth anywhere from $5 in standard Clad Proof condition to over $1,200 for high-grade Silver specimens. While most quarters you find in pocket change are only worth face value, those bearing the “S” mint mark from San Francisco are special collector issues that often carry a significant premium.

Coin Version	Condition / Grade	Estimated Value
2006-S Clad Proof	PR 69 Deep Cameo	$5 – $10
2006-S Clad Proof	PR 70 Deep Cameo	$25 – $45
2006-S Silver Proof	PR 69 Deep Cameo	$12 – $18
2006-S Silver Proof	PR 70 Deep Cameo	$40 – $75+

Understanding the 2006-S Colorado Proof Quarters

If you have discovered a 2006 Colorado quarter with an “S” mint mark, you have found a Proof coin. Unlike the Denver (D) or Philadelphia (P) versions intended for daily commerce, the San Francisco (S) mint only produced these for collectors. To know exactly what you have, using a top coin identifier app can help you distinguish between the two different metal compositions issued this year.

The San Francisco Mint struck two distinct types of Colorado quarters in 2006. The first is the Copper-Nickel Clad version, which looks like a shiny version of a standard quarter. The second is the 90% Silver Proof version, which was sold in special silver proof sets. Because these were never meant to be spent at the grocery store, finding one in your change usually means someone broke open a collector’s set.

Identifying these coins requires a keen eye. Proof coins are struck using polished dies and planchets, resulting in a mirror-like background and frosted details. If your coin looks exceptionally “shiny” compared to others, it is likely a proof. To get an instant valuation on the go, the CoinKnow app is a fantastic tool for casual hunters to scan and log their finds.

Clad vs. Silver: Assessing the Metal Content

The value of your 2006-S Colorado quarter depends heavily on whether it is made of base metal or silver. The Silver Proof version contains 0.1808 troy ounces of pure silver. This gives the coin an inherent “melt value” that fluctuates with the silver market. Even in poor condition, a silver Colorado quarter will always be worth significantly more than 25 cents.

You can check the edge of the coin to determine the composition. Look at the “third side” of the quarter. If you see a solid silver stripe with no visible copper layer (the brownish-orange line), you likely have the 90% silver version. If you see that copper core, it is a standard clad proof. For more detailed data, you can view the current market prices for 2006 state quarters to see how they compare to other states issued the same year.

Collectors often use the CoinKnow app to track the silver spot price alongside their coin’s numismatic value. This ensures they don’t accidentally spend a coin that is worth $10 or more just in metal weight.

Feature	Clad Proof (S)	Silver Proof (S)
Composition	8.33% Nickel, Balance Copper	90% Silver, 10% Copper
Weight	5.67 grams	6.25 grams
Edge Appearance	Copper layer visible	Solid silver color

The Design of the Colorado State Quarter

The Colorado quarter was the 38th coin released in the 50 State Quarters® Program. It features a sweeping view of the rugged Rocky Mountains with evergreen trees and a “Colorful Colorado” banner. The design was created by Norman E. Nemeth and captures the natural majesty of the state, which joined the Union in 1876.

Because the design is intricate, Proof coins often showcase a “Deep Cameo” (DCAM) effect. This is where the mountains and trees appear stark white and frosty against a black, mirror-like sky. Collectors pay a premium for “Ultra Cameo” or “Deep Cameo” designations from grading services like PCGS or NGC.

When evaluating the condition of your 2006-S Colorado State Quarter, look for scratches or “hairlines.” Since these coins were minted for beauty, any marks from circulation or improper handling will lower the collector value of your 2006 quarters. Even small scratches visible only under a magnifying glass can drop a coin from a PR 70 (perfect) to a PR 67 (average collector grade).

The Importance of Grading: PR68 vs. PR70

In the world of coin collecting, the “Grade” is everything. For 2006-S Proofs, the difference between a grade of PR69 and a perfect PR70 can double or triple the price. A PR70 coin is flawless under 5x magnification, exhibiting no production flaws, spots, or contact marks.

Most 2006-S quarters found in modern proof sets will grade at PR69. These are beautiful coins but very common. The real “money” is found in the PR70 grade, particularly for the Silver versions. If you believe your coin is perfect, it might be worth sending to a professional grading service, though this is usually only profitable if the coin is Silver.

If you are unsure whether your coin is worth the grading fee, the CoinKnow app’s visual recognition technology can help you compare your coin’s luster and surface quality with known high-grade examples. It provides a great baseline for beginners who don’t want to spend $30 on a grading fee for a $5 coin.

Grade Designation	Clad Value	Silver Value
PR 67 Deep Cameo	$3.00	$10.00
PR 68 Deep Cameo	$5.00	$14.00
PR 69 Deep Cameo	$8.00	$18.00
PR 70 Deep Cameo	$35.00	$85.00

Are There Any 2006-S Colorado Quarter Errors?

Errors on proof coins are extremely rare because the San Francisco Mint uses much stricter quality control for these products than the Philadelphia or Denver Mints use for circulation coins. However, rarities do occasionally slip through. The most common “errors” for proof coins are actually planchet flaws or “strike-throughs,” where a piece of dust or debris was caught between the die and the coin.

Another thing to look for is “doubled dies.” While no major 2006-S Colorado doubled die has been mainstreamed by the Cherrypickers’ Guide, collectors always keep an eye out for doubling in the inscriptions “COLORADO” or “1876.” If you find a coin that appears to have secondary images on the lettering, you may have a unique and valuable discovery.

Keep in mind that many beginners mistake “machine doubling” (a common manufacturing artifact) for a true “doubled die” error. Machine doubling does not typically add value, whereas a hub-doubled die can make a coin worth hundreds of dollars. Checking your coin against high-resolution photos in a coin app can help clarify what you are seeing.

How to Sell Your Colorado State Quarter

Once you’ve determined that your 2006-S Colorado quarter is a Silver Proof or a high-grade Clad version, you might want to cash in. For coins valued under $20, your best bet is usually a local coin shop or an online marketplace like eBay. Collectors searching for specific dates to fill their albums are the primary buyers for these coins.

If you have a certified PR70 Silver Proof, you might consider a specialized numismatic auction. These coins appeal to “registry set” collectors who compete to have the finest known collection of State Quarters. In these circles, a single point in grade can mean the difference between a $50 sale and a $150 sale.

Always ensure you handle your proof coins by the edges only. The oils from your skin can leave permanent fingerprints on the mirror-like surfaces of a proof coin, which will instantly destroy its collector value. Store them in PVC-free plastic flips or capsules to maintain their condition for years to come.

FAQ

Q: How can I tell if my 2006-S quarter is silver?

A: Check the weight and the edge. A silver quarter weighs 6.25 grams, whereas a clad quarter weighs 5.67 grams. Additionally, the edge of a silver quarter will be solid silver-colored, with no brown copper stripe visible.

Q: Why is my 2006-S Colorado quarter worth more than a D or P mint mark?

A: The “S” mint mark indicates it is a Proof coin, which was minted in much lower quantities (roughly 2-3 million) compared to the hundreds of millions of P and D quarters. They were also made with higher quality standards for collectors.

Q: Is a 2006 Colorado quarter found in the trash or on the street worth anything?

A: If it is a standard P or D mint mark and is heavily worn, it is only worth 25 cents. If it is an “S” mint mark but is scratched and dirty (“impaired proof”), it may still be worth $1-$2 if clad, or its silver melt value if it’s the silver version.

Q: Where is the mint mark on the Colorado quarter?

A: The mint mark (P, D, or S) is located on the obverse (heads) side of the coin, just to the right of George Washington’s ponytail.