diff --git a/config/services.yaml b/config/services.yaml
index 2c09a95..d09d0cf 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -61,6 +61,13 @@ parameters:
         - '04-01'
         - '10-01'
 
+    # The season window as MM-DD. It wraps the turn of the year and is named after the
+    # calendar year it starts in ("Saison 2024/25"). The teamer info modal buckets a
+    # teamer's dispositions by the season their assignment starts in; one whose
+    # assignment starts outside this window is counted as "außerhalb der Saison".
+    season_start: '11-01'
+    season_end: '04-01'
+
     # Houses, hotel code: name. The name is used both as a label and to match
     # destination.hotel, the code to match destination.hotelCode.
     houses:
@@ -104,6 +111,8 @@ services:
             # App\Config\EmailTextCatalog, since its contents matter on few requests.
             $emailTextsFile: '%kernel.project_dir%/config/email_texts.yaml'
             $mailingBusTransport: '%mailing_bus_transport%'
+            $seasonStart: '%season_start%'
+            $seasonEnd: '%season_end%'
 
     # Tagged by interface rather than listed by hand: order between collectors is
     # irrelevant, so the only thing an explicit list could add here is the chance to
diff --git a/src/Config/SeasonCalendar.php b/src/Config/SeasonCalendar.php
new file mode 100644
index 0000000..484330b
--- /dev/null
+++ b/src/Config/SeasonCalendar.php
@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Config;
+
+use Carbon\CarbonImmutable;
+
+/**
+ * The recurring season window, as configured by the "season_start"/"season_end" parameters.
+ *
+ * A season is a MM-DD..MM-DD window that normally wraps the turn of the year (01.11.–01.04.)
+ * and is named after the calendar year it starts in - "Saison 2024/25". It is used to bucket
+ * a teamer's dispositions per season in the info modal; the date that decides the bucket is
+ * the assignment's effective start, mirroring App\Repository\Filter\SeasonPeriodFilter.
+ *
+ * Both ends are inclusive: an assignment starting on 01.04. still belongs to the season that
+ * began the previous 01.11. A start date between the two (02.04.–31.10. for the default
+ * window) belongs to no season and is reported separately.
+ */
+final class SeasonCalendar
+{
+    public function __construct(
+        private readonly string $seasonStart,
+        private readonly string $seasonEnd,
+    ) {
+    }
+
+    /**
+     * The calendar year the season containing $date starts in, or null when $date lies
+     * outside any season window.
+     */
+    public function seasonYearFor(\DateTimeInterface $date): ?int
+    {
+        $day = CarbonImmutable::instance($date)->startOfDay();
+        $year = (int) $day->format('Y');
+
+        $start = $this->boundaryFor($this->seasonStart, $year);
+        $end = $this->boundaryFor($this->seasonEnd, $year);
+
+        // Wrapping window (the default 01.11.–01.04. case): the season straddles New Year.
+        if ($end < $start) {
+            if ($day >= $start) {
+                return $year;
+            }
+
+            if ($day <= $end) {
+                return $year - 1;
+            }
+
+            return null;
+        }
+
+        // Non-wrapping window: kept correct should the config ever describe a window that
+        // stays within one calendar year.
+        return $day >= $start && $day <= $end ? $year : null;
+    }
+
+    /**
+     * null -> "außerhalb der Saison"; 2024 -> "Saison 2024/25".
+     */
+    public function label(?int $seasonYear): string
+    {
+        if (null === $seasonYear) {
+            return 'außerhalb der Saison';
+        }
+
+        return sprintf('Saison %d/%02d', $seasonYear, ($seasonYear + 1) % 100);
+    }
+
+    private function boundaryFor(string $monthDay, int $year): CarbonImmutable
+    {
+        $boundary = CarbonImmutable::createFromFormat('Y-m-d', sprintf('%d-%s', $year, $monthDay));
+
+        if (false === $boundary instanceof CarbonImmutable) {
+            throw new \InvalidArgumentException(sprintf('Season boundary "%s" is not a valid MM-DD date.', $monthDay));
+        }
+
+        return $boundary->startOfDay();
+    }
+}
diff --git a/src/Controller/Administrative/Teamer/InfoController.php b/src/Controller/Administrative/Teamer/InfoController.php
index 44a7476..855b032 100644
--- a/src/Controller/Administrative/Teamer/InfoController.php
+++ b/src/Controller/Administrative/Teamer/InfoController.php
@@ -5,6 +5,7 @@ namespace App\Controller\Administrative\Teamer;
 use App\Controller\Traits\ReturnUrlTrait;
 use App\Entity\Teamer;
 use App\Repository\DispositionRepository;
+use App\Service\Teamer\SeasonDispositionCounter;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\ExpressionLanguage\Expression;
 use Symfony\Component\HttpFoundation\Request;
@@ -16,8 +17,10 @@ class InfoController extends AbstractController
 {
     use ReturnUrlTrait;
 
-    public function __construct(private readonly DispositionRepository $dispositionRepository)
-    {
+    public function __construct(
+        private readonly DispositionRepository $dispositionRepository,
+        private readonly SeasonDispositionCounter $seasonDispositionCounter,
+    ) {
     }
 
     #[Route('/administrative/teamer/info/{uuid}', name: 'app_administrative_teamer_info')]
@@ -37,6 +40,7 @@ class InfoController extends AbstractController
         return $this->render('administrative/teamer/modal_info.html.twig', [
             'teamer' => $teamer,
             'recentDispositions' => $recentDispositions,
+            'dispositionsPerSeason' => $this->seasonDispositionCounter->countPerSeason($teamer),
             'returnUrl' => $returnUrl,
         ]);
     }
diff --git a/src/Repository/DispositionRepository.php b/src/Repository/DispositionRepository.php
index a07c323..e022854 100644
--- a/src/Repository/DispositionRepository.php
+++ b/src/Repository/DispositionRepository.php
@@ -144,6 +144,37 @@ class DispositionRepository extends ServiceEntityRepository
         ;
     }
 
+    /**
+     * The effective start date of every non-called-off disposition of a teamer, one row
+     * each, for the per-season tally in the info modal.
+     *
+     * Same teamer/called-off filtering as findRecentDispositionsByTeamer(), but unbounded
+     * and stripped to the one date it needs: assignment.dateFrom falling back to the
+     * destination's, the season convention shared with SeasonPeriodFilter.
+     *
+     * @return array<int, array{seasonDate: string}>
+     */
+    public function findDispositionSeasonDatesByTeamer(Teamer $teamer): array
+    {
+        $qb = $this->createQueryBuilder('disposition');
+
+        return $qb
+            ->select('COALESCE(assignment.dateFrom, destination.dateFrom) AS seasonDate')
+            ->innerJoin('disposition.assignment', 'assignment')
+            ->innerJoin('assignment.destination', 'destination')
+            ->where($qb->expr()->andX(
+                $qb->expr()->eq('disposition.teamer', ':teamer'),
+                $qb->expr()->neq('assignment.status', ':assignmentStatus'),
+                $qb->expr()->neq('disposition.status', ':dispositionStatus')
+            ))
+            ->setParameter('teamer', $teamer)
+            ->setParameter('assignmentStatus', Assignment::STATUS_CALLED_OFF)
+            ->setParameter('dispositionStatus', Disposition::STATUS_CALLED_OFF)
+            ->getQuery()
+            ->getScalarResult()
+        ;
+    }
+
     public function findCurrentDispositionsByTeamer(Teamer $teamer): array
     {
         $qb = $this->createQueryBuilder('disposition');
diff --git a/src/Service/Teamer/SeasonDispositionCounter.php b/src/Service/Teamer/SeasonDispositionCounter.php
new file mode 100644
index 0000000..fd80ee3
--- /dev/null
+++ b/src/Service/Teamer/SeasonDispositionCounter.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace App\Service\Teamer;
+
+use App\Config\SeasonCalendar;
+use App\Entity\Teamer;
+use App\Repository\DispositionRepository;
+
+/**
+ * Tallies a teamer's dispositions per season for the info modal.
+ *
+ * Each non-called-off disposition is bucketed by the season its assignment starts in
+ * (see SeasonCalendar); assignments starting outside any season window land in a single
+ * "außerhalb der Saison" bucket that is always listed last.
+ */
+class SeasonDispositionCounter
+{
+    private const OFF_SEASON = 'off_season';
+
+    public function __construct(
+        private readonly DispositionRepository $dispositionRepository,
+        private readonly SeasonCalendar $seasonCalendar,
+    ) {
+    }
+
+    /**
+     * @return list<array{label: string, count: int}> newest season first, off-season last
+     */
+    public function countPerSeason(Teamer $teamer): array
+    {
+        $counts = [];
+
+        foreach ($this->dispositionRepository->findDispositionSeasonDatesByTeamer($teamer) as $row) {
+            if (empty($row['seasonDate'])) {
+                continue;
+            }
+
+            $seasonYear = $this->seasonCalendar->seasonYearFor(new \DateTimeImmutable($row['seasonDate']));
+            $key = $seasonYear ?? self::OFF_SEASON;
+            $counts[$key] = ($counts[$key] ?? 0) + 1;
+        }
+
+        $offSeasonCount = $counts[self::OFF_SEASON] ?? null;
+        unset($counts[self::OFF_SEASON]);
+        krsort($counts);
+
+        $rows = [];
+        foreach ($counts as $seasonYear => $count) {
+            $rows[] = ['label' => $this->seasonCalendar->label((int) $seasonYear), 'count' => $count];
+        }
+
+        if (null !== $offSeasonCount) {
+            $rows[] = ['label' => $this->seasonCalendar->label(null), 'count' => $offSeasonCount];
+        }
+
+        return $rows;
+    }
+}
diff --git a/templates/administrative/teamer/modal_info.html.twig b/templates/administrative/teamer/modal_info.html.twig
index 8fd1df7..8f63a70 100644
--- a/templates/administrative/teamer/modal_info.html.twig
+++ b/templates/administrative/teamer/modal_info.html.twig
@@ -65,6 +65,21 @@
                 </li>
             {% endfor %}
             </ul>
+            <h2 class="text-lg font-bold">
+                Einsätze pro Saison
+            </h2>
+            <ul class="pb-4 divide-y divide-gray-200">
+            {% for season in dispositionsPerSeason %}
+                <li class="py-1 flex justify-between">
+                    <span>{{ season.label }}</span>
+                    <span>{{ season.count }}</span>
+                </li>
+            {% else %}
+                <li class="py-2">
+                    -
+                </li>
+            {% endfor %}
+            </ul>
             {% if is_granted('ROLE_ADMIN') %}
                 <h2 class="text-lg font-bold">
                     Interne Anmerkungen
diff --git a/tests/Config/SeasonCalendarTest.php b/tests/Config/SeasonCalendarTest.php
new file mode 100644
index 0000000..308b2e1
--- /dev/null
+++ b/tests/Config/SeasonCalendarTest.php
@@ -0,0 +1,73 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Config;
+
+use App\Config\SeasonCalendar;
+use PHPUnit\Framework\TestCase;
+
+class SeasonCalendarTest extends TestCase
+{
+    private function winter(): SeasonCalendar
+    {
+        return new SeasonCalendar('11-01', '04-01');
+    }
+
+    /**
+     * @dataProvider winterDates
+     */
+    public function testSeasonYearForTheWrappingWinterWindow(string $date, ?int $expected): void
+    {
+        $this->assertSame($expected, $this->winter()->seasonYearFor(new \DateTimeImmutable($date)));
+    }
+
+    public static function winterDates(): iterable
+    {
+        yield 'first day of the season' => ['2024-11-01', 2024];
+        yield 'december, same calendar year' => ['2024-12-20', 2024];
+        yield 'february, next calendar year' => ['2025-02-10', 2024];
+        yield 'last day of the season is inclusive' => ['2025-04-01', 2024];
+        yield 'time of day does not matter' => ['2025-04-01 23:59:00', 2024];
+        yield 'day after the season ends' => ['2025-04-02', null];
+        yield 'high summer' => ['2025-07-15', null];
+        yield 'day before the next season starts' => ['2025-10-31', null];
+        yield 'start of the following season' => ['2025-11-01', 2025];
+    }
+
+    public function testLabel(): void
+    {
+        $calendar = $this->winter();
+
+        $this->assertSame('Saison 2024/25', $calendar->label(2024));
+        $this->assertSame('Saison 2009/10', $calendar->label(2009));
+        $this->assertSame('außerhalb der Saison', $calendar->label(null));
+    }
+
+    /**
+     * @dataProvider summerDates
+     */
+    public function testSeasonYearForANonWrappingWindow(string $date, ?int $expected): void
+    {
+        $calendar = new SeasonCalendar('06-01', '09-01');
+
+        $this->assertSame($expected, $calendar->seasonYearFor(new \DateTimeImmutable($date)));
+    }
+
+    public static function summerDates(): iterable
+    {
+        yield 'before the window' => ['2025-05-31', null];
+        yield 'first day' => ['2025-06-01', 2025];
+        yield 'inside' => ['2025-07-15', 2025];
+        yield 'last day' => ['2025-09-01', 2025];
+        yield 'after the window' => ['2025-09-02', null];
+        yield 'turn of the year is not in season' => ['2025-01-01', null];
+    }
+
+    public function testAnInvalidBoundaryIsRejected(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+
+        (new SeasonCalendar('xx-yy', '04-01'))->seasonYearFor(new \DateTimeImmutable('2025-01-01'));
+    }
+}
diff --git a/tests/Service/Teamer/SeasonDispositionCounterTest.php b/tests/Service/Teamer/SeasonDispositionCounterTest.php
new file mode 100644
index 0000000..c9353d5
--- /dev/null
+++ b/tests/Service/Teamer/SeasonDispositionCounterTest.php
@@ -0,0 +1,71 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Service\Teamer;
+
+use App\Config\SeasonCalendar;
+use App\Entity\Teamer;
+use App\Repository\DispositionRepository;
+use App\Service\Teamer\SeasonDispositionCounter;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+class SeasonDispositionCounterTest extends TestCase
+{
+    private DispositionRepository&MockObject $dispositionRepository;
+    private SeasonDispositionCounter $counter;
+
+    protected function setUp(): void
+    {
+        $this->dispositionRepository = $this->createMock(DispositionRepository::class);
+
+        $this->counter = new SeasonDispositionCounter(
+            $this->dispositionRepository,
+            new SeasonCalendar('11-01', '04-01'),
+        );
+    }
+
+    public function testCountsAreGroupedPerSeasonNewestFirstWithOffSeasonLast(): void
+    {
+        $this->stubDates([
+            '2024-12-10', // Saison 2024/25
+            '2025-02-01', // Saison 2024/25
+            '2024-01-15', // Saison 2023/24
+            '2025-07-20', // außerhalb der Saison
+        ]);
+
+        $this->assertSame([
+            ['label' => 'Saison 2024/25', 'count' => 2],
+            ['label' => 'Saison 2023/24', 'count' => 1],
+            ['label' => 'außerhalb der Saison', 'count' => 1],
+        ], $this->counter->countPerSeason(new Teamer()));
+    }
+
+    public function testATeamerWithNoDispositionsYieldsNoRows(): void
+    {
+        $this->stubDates([]);
+
+        $this->assertSame([], $this->counter->countPerSeason(new Teamer()));
+    }
+
+    public function testOnlyOffSeasonDispositionsYieldASingleRow(): void
+    {
+        $this->stubDates(['2025-05-01', '2025-09-30']);
+
+        $this->assertSame([
+            ['label' => 'außerhalb der Saison', 'count' => 2],
+        ], $this->counter->countPerSeason(new Teamer()));
+    }
+
+    /**
+     * @param list<string> $dates
+     */
+    private function stubDates(array $dates): void
+    {
+        $this->dispositionRepository
+            ->method('findDispositionSeasonDatesByTeamer')
+            ->willReturn(array_map(static fn (string $date): array => ['seasonDate' => $date], $dates))
+        ;
+    }
+}