What Season Is Baseball? MLB Schedule Explained

By Sarah Miller · December 7, 2052

Baseball's primary season in Major League Baseball (MLB) runs from late March or early April through September, with postseason games extending into November.

When Is Baseball Season?

Major League Baseball (MLB), the premier professional baseball league, holds its regular season from late March or early April through September. The postseason typically follows, lasting into early November, especially if the World Series extends to Game 7. This makes baseball a quintessential spring, summer, and early fall sport in North America.

MLB Regular Season Schedule

The MLB regular season is structured around a 162-game schedule for each of the 30 teams, evenly split between the American League (AL) and National League (NL). Games begin in late March or early April, following a shorter Spring Training period known as "Spring Break" or preseason.

Key Dates in the MLB Calendar

Spring Training: Begins mid-February, ends late March
Opening Day: Typically last week of March or first week of April
All-Star Break: Mid-July, including the Home Run Derby and All-Star Game
Trade Deadline: Early August (since 2019)
Regular Season Ends: Late September or early October
Postseason Begins: Early October
World Series: Late October to early November

Why Baseball Is Considered a Spring and Summer Sport

Despite extending into the fall, baseball is culturally associated with spring and summer due to its opening months and outdoor nature. Warm weather is essential for gameplay, making it impractical during winter in most U.S. regions.

Factors Influencing Baseball's Season Timing

Weather dependency: Outdoor fields require mild temperatures and minimal precipitation
School schedules: Aligns with youth and collegiate leagues during summer
Historical tradition: Originated in 19th-century America when spring marked the start of outdoor recreation
TV broadcasting: Summer games attract consistent viewership without major sports competition

Comparison Across Baseball Leagues

Different leagues follow varied seasonal calendars based on geography and climate. While MLB dominates in popularity, other leagues adapt to local conditions.

League	Country	Season Start	Season End	Games per Team
MLB	USA/Canada	March/April	September/October	162
NPB (Japan)	Japan	March	October	143
KBO League	South Korea	April	October	144
Liga Mexicana	Mexico	April	August	108
Australian Baseball League	Australia	November	February	40

Table data source:1, 2, 3, 4, 5

The table shows that while most top-tier leagues operate during the Northern Hemisphere’s spring through fall, Southern Hemisphere leagues like Australia's ABL align their seasons with local summer (November–February). MLB plays the most games annually, reflecting its commercial scale and fan engagement demands.

Youth and Collegiate Baseball Seasons

In the United States, amateur baseball follows a similar seasonal pattern but with shorter durations. High school and college teams play primarily in the spring to avoid conflicts with football and basketball seasons.

Amateur Baseball Timelines

NCAA Division I: February to June, culminating in the College World Series in Omaha
High School: March to May, varying by state
Little League: Season runs April to July, with the Little League World Series in August

Frequently Asked Questions About Baseball Season

What months are baseball season?

Baseball season in MLB runs from March/April through September, with playoffs into November. Other leagues may vary based on region.

Does baseball happen all year round?

No single league operates year-round, but global leagues ensure some professional baseball is played every month. For example, Australia's ABL runs November–February, bridging the gap between MLB seasons.

When does MLB regular season start and end?

The MLB regular season typically starts in late March or early April and ends in late September or early October.

How long is the baseball season?

The MLB regular season spans about six months, with 162 games per team. Including Spring Training and postseason, it lasts roughly eight months.

Why does baseball season start in spring?

Baseball starts in spring because it is an outdoor sport requiring warm weather. Spring provides suitable climate conditions across most of North America, aligning with historical and cultural traditions.