Under 5% ABV but loaded with hop character. Engineered to be drinkable in volume. The most fragile style on the shelf — drink fresh.
Session IPAs are the most freshness-sensitive style in modern craft. Without the alcohol heat or malt body of a regular IPA to provide stability, the hop character is the entire beer. Hop aromatics fade just as fast in a 4.5% IPA as in a 7% IPA — but in a session beer, there's less malt structure to mask the staleness. A 6-week-old session IPA tastes noticeably tired; a 3-month-old one is sad.
Refrigerate immediately and continuously. Cold storage is the only meaningful intervention. Session IPAs at room temperature for even a few warm summer days age dramatically.
Within 4-5 weeks of canning for full hop expression. Past 8 weeks the beer is on the downward slope. Past 3 months you're drinking a different beer than what was intended. Check the canned-on date before buying — for this style, freshness matters more than brewery reputation.
These breweries either specialize in Session IPA or produce notable examples: