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Questions/Church Seasons

What Is Reformation Day? Why October 31 Matters to Christians

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Illustration of an open Bible with a golden cross and rays of light on a deep violet background, with the words Reformation Day October 31

Reformation Day is observed every year on October 31. It marks the day in 1517 that Martin Luther, a monk and university professor in Wittenberg, Germany, challenged the church's sale of indulgences by sending his Ninety-five Theses to Archbishop Albert of Mainz. That act is widely seen as the start of the Protestant Reformation. In 2026 it falls on a Saturday, the day before All Saints' Day (Sunday, November 1). If you are a Protestant, it is a day to remember what the Reformation recovered. If you are not, it is a useful reminder of why so many Christian traditions exist and what they argued about.

What actually happened on October 31, 1517?

In 1517 a Dominican friar, Johann Tetzel, was raising money in Germany for the rebuilding of St. Peter's Basilica in Rome by selling indulgences, documents that were popularly understood to reduce the punishment owed for sin. Luther thought this misled ordinary people about forgiveness. On October 31, 1517 he wrote to Albert, Archbishop of Mainz, and enclosed a copy of his *Disputation on the Power and Efficacy of Indulgences*, which became known as the Ninety-five Theses.

The famous picture of Luther nailing the theses to the church door is worth a short caveat. The account comes from Philip Melanchthon, who wrote about it years later, and some historians question it because no contemporary evidence survives. Others point out that posting theses on the Castle Church door was the normal way to announce a university debate at Wittenberg. What is not in doubt is the letter to Albert and the speed of what followed: the theses were translated from Latin into German, printed and copied, and spread across Germany within weeks and across Europe within months, helped along by the printing press.

Luther did not set out to start a new church. The theses were written as an invitation to debate, and the tone is searching rather than angry. The very first one is the heart of it: Jesus' call to repent was meant to make the whole of a believer's life one of repentance, not a single purchase or ritual. If that idea interests you, Godly Sorrow vs. Worldly Sorrow: What 2 Corinthians 7:10 Means for Real Change looks at the same theme in Paul's letters.

What did the Reformation stand for?

The Reformers did not all agree on everything, and the movement quickly split into Lutheran, Reformed (Zwingli and later Calvin) and other streams. But five short Latin phrases, often called the five *solae*, summarise what most of them were pressing:

  • *Sola Scriptura* (Scripture alone): the Bible is the final authority for faith, above church tradition.
  • *Sola Fide* (faith alone): sinners are made right with God by trusting Christ, not by earning it.
  • *Sola Gratia* (grace alone): salvation is God's gift.
  • *Solus Christus* (Christ alone): Jesus is the only mediator between God and people.
  • *Soli Deo Gloria* (glory to God alone): all of life is lived for God's glory.

The verse most often tied to the movement is Paul's: "For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, that no one would boast" (Ephesians 2:8-9, WEB). Luther's own turning point, by his account, came from reading "the righteous shall live by faith" in Romans 1:17.

The Reformation also changed everyday church life. Luther published a German New Testament in 1522 so that people could read Scripture in their own language. Services moved toward the local language, congregational singing grew (Luther wrote hymns, including "A Mighty Fortress Is Our God"), and Bible reading became something for ordinary believers rather than only clergy. If you want to build that habit, How to Read the Bible When It Feels Like a Textbook is a practical place to start.

Who celebrates Reformation Day?

  • Lutheran and Reformed churches mark it most strongly, often with a special service, red paraments (red for the Holy Spirit and for martyrs), and hymns such as Luther's. Many observe Reformation Sunday on the Sunday on or near October 31.
  • Other Protestants often remember the day too, though it is rarely a major event outside Lutheran and Reformed circles.
  • Several countries recognise it by law. It is a public holiday in Slovenia and in Chile (where it is the National Day of Evangelical and Protestant Churches), and in several German states, including Brandenburg, Saxony, Saxony-Anhalt and Thuringia.
  • Catholics do not traditionally celebrate it as a feast, but in recent decades the Catholic Church has taken part in joint commemorations. Lutherans and Catholics signed a Joint Declaration on the Doctrine of Justification at Augsburg on October 31, 1999, and Pope Francis joined Lutheran leaders at Lund, Sweden, on October 31, 2016 to begin the 500th anniversary year.

Reformation Day, Halloween and All Saints' Day

October 31 is also Halloween, which began as the eve of All Hallows' (All Saints') Day on November 1. Some historians suggest Luther chose that date because crowds would gather at the Castle Church for All Saints' Day, though that has never been proven. For many Protestant families the overlap is an opportunity: swap or add to the candy and costumes with a church-history dinner, a hymn sing, or a reading of the theses. Should Christians Celebrate Halloween? Start With All Saints' Day looks at how to hold those two days together without turning it into a fight.

Simple ways to keep Reformation Day

You do not need a formal program. A few small, honest ideas:

1. Read two passages. Romans 1:16-17 and Ephesians 2:1-10 are the heart of the Reformation message. Read them slowly, then say in one sentence what you believe about being forgiven. 2. Sing one hymn. "A Mighty Fortress Is Our God" is a good place to start. Read the words out loud if singing is not your strength. 3. Tell the story to kids. Keep it simple: a man read the Bible, realised that forgiveness is a gift, and spoke up. A short picture book or a ten-minute family retelling is enough. 4. Pray for Christian unity. Jesus prayed "that they may all be one" (John 17:21, WEB). The Reformation also left real divisions, and remembering it well includes a prayer for peace between believers who still disagree. 5. Read your Bible. "Your word is a lamp to my feet, and a light for my path" (Psalm 119:105, WEB). Pick up a book you have never read.

A fair way to think about it

Reformation Day is not a feast every Christian is required to keep, and it is not an attack on anyone's church. For Protestants, it is a day to give thanks that Scripture and the gospel of grace were put back into ordinary hands. For everyone, it is a chance to look at church history honestly, including the part where Christians failed each other, and to ask what we are still trying to learn.

Frequently asked questions

What is Reformation Day?

A Christian observance on October 31 that remembers the beginning of the Protestant Reformation in 1517, when Martin Luther sent his Ninety-five Theses against the sale of indulgences.

Is Reformation Day the same as Halloween?

They fall on the same date, but they are different things. Halloween is the eve of All Saints' Day. Reformation Day remembers Luther and the Reformation. Many churches mark both.

Is Reformation Day a public holiday?

Yes, in some places: Slovenia, Chile and several German states. In most other countries it is a church observance only.

Is Reformation Day in the Bible?

No. It is a church-history commemoration, not a biblical command. The doctrines it celebrates, such as salvation by grace through faith, come from passages like Ephesians 2:8-9 and Romans 1:17.

Do Catholics celebrate Reformation Day?

Not as a feast. But Catholic and Lutheran leaders have held joint events, including the 1999 Joint Declaration on justification and the 2016 commemoration in Lund.

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