Creating and Managing MTG League Seasons

You create and manage MTG league seasons in Nerd Leagues from your league's Manage League page. The Seasons panel is commissioner-only, and the whole workflow — create, edit, archive, delete — lives inside a single section. Here's what each control does.

Manage MTG league seasons from the Manage League page

Manage MTG league seasons by opening your league, clicking Manage League, and expanding the Seasons panel. Inside you'll find the create form at the top and a list of every season you've ever made — active, expired, and archived — sorted by start date with the newest first.

Only the commissioner can see this section. Members and non-members opening the league page won't even know the panel exists.

MTG League Seasons covers what a season is and what changes when one is active.

Create an MTG league season

Create an MTG league season by filling out four fields and clicking Create Season:

• Season Title — required, up to 100 characters. This shows up as the season's pill on the league page, where short titles fit best (Spring 2026, Q1 League, March Madness).
• Description (optional) — a short note that displays under the title in the Manage League list. Players don't see this on the public league page; it's just for your own bookkeeping.
• Start Date — required. The first day games will count toward this season.
• End Date — required, and must be on or after the start date. The last day games will count.

Date matching is inclusive on both ends. A game's recorded date — not the date it was played — is what determines whether it falls inside the season window. That distinction matters if you log a game several days after the table broke up.

There is no validation against overlapping date ranges. A monthly season can run alongside a quarterly one, or a playoffs season nested inside an annual one, and a single recorded game counts toward all of them — see Overlapping MTG League Seasons.

Edit a season after it's already running

Edit a season by clicking the Edit button on its row in the Seasons list. An inline form expands underneath with the same four fields plus Save and Cancel buttons. The same validation rules apply — title plus both dates are required, and the end date can't be before the start date.

Editing a season's dates does not retroactively rescore games. A game is scored against the season windows that covered it at the time it was recorded, so games already logged keep the scoring they had. If you've shifted a season's dates significantly after games have been logged, ask an admin to run a season ELO recalculation so the standings match the new window cleanly.

Archive a season when it's over

Archive an MTG league season by clicking Archive on its row. Archiving takes the season off the public league page while keeping the standings, the ELO history, and every game it scored.

What an archive does:

• Hides the season's pill from the public league page (Members, Decks, ELO History, and Games tabs all stop offering it as a filter).
• Keeps the row in your Manage League list, dimmed and labeled with an Archived badge.
• Stops new games from updating its standings, even if they fall inside the date range.
• Preserves every stored ELO snapshot — wins, losses, plus/minus, ELO history — exactly as it was when you archived.

Archiving is reversible. The same button reads Unarchive on archived rows; clicking it puts the season back to active. Note that any games recorded while the season was archived won't have updated its standings — those games stay outside the season's stored data — but unarchiving doesn't damage anything.

Delete a season

Delete a season by clicking Delete on its row. A browser confirmation dialog asks: "Are you sure you want to delete the season '[title]'? All ELO data for this season will be permanently deleted."

Delete cannot be undone:

• The season is removed from your league.
• Every per-player and per-deck ELO snapshot tied to it is erased.
• Every per-game ELO change tied to it is erased.
• The season disappears from the public league page and from your Manage League list.

Archiving preserves all of that and is reversible; deleting is not. The difference matters most for seasons created by mistake or for testing, where there's nothing worth keeping.

Where to go next

Once a season exists and isn't archived, every league game whose recorded date falls inside its window automatically updates its standings — no extra step on your part. That auto-update uses the same K-factor and expected-score math that drives per-league and yearly ELO; for those calculation details, see MTG League ELO: How Per-League Ratings and Standings Work.

Overlapping MTG League Seasons covers how one game updates several seasons at once, and Season Standings covers how the per-season tabs read on the league page. The Commissioner Role covers the rest of the Manage League page.