YeastMatch

Substitute for Hallertauer Mittelfrüh: hops like Hallertauer Mittelfrüh

Hallertauer Mittelfrüh (Germany)

If you cannot get Hallertauer Mittelfrüh, this is the closest hop and what changes in the beer.

Close, with a caveat. Hallertau Tradition or Saaz is the nearest substitute for Hallertauer Mittelfrüh, but the aroma shifts.
Substitution
Hallertauer Mittelfrüh (Germany)
Hallertau TraditionSaaz

Original hop vs substitute

Out ofHallertauer Mittelfrüh (Germany)
Closest substituteHallertau Tradition or Saaz
Original alpha acid2.3 to 6.6 %
Original myrceneup to 50.1 %
Original aromaSpicy-woody with myrrh, carnation and lilac, plus red currant and lemon

Notes

If Hallertauer Mittelfrüh is unavailable, another noble hop such as Saaz is the nearest spicy-floral substitute.

Saaz is a little more spicy-woody and Tettnang a little more floral; all are low-alpha aroma hops, so match by aroma family and use them generously rather than matching bitterness.

What to buy instead

Search Amazon for Hallertau Tradition or Saaz hopsaffiliate searchFind Hallertau Tradition or Saaz hops on eBayaffiliate

Related

Hallertauer Mittelfrühfull hop dataBest hops for a German Pilsnerwhere it is a pickSaaz (Saazer)the substitute in full (Czech Republic)

Sources: BarthHaas Hallertauer Mittelfrueh hop variety profile · BarthHaas Saazer (Saaz) hop variety profile · BarthHaas Tettnang Tettnanger hop variety profile