The following are known Action Replay Codes for Spyro: Season of Ice on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
92df696d
a01d6892
cfc4a54e
f4ed6213

Infinite Health
088b3e3d
b83489ad

Infinite Lives
a38c92df
f9e32e9a

Max Gems
1e79ec3a
5ededc66

Max Fairies
aca38f7f
33c950db

Hover
8a7eef3e
e3edf79a

Aut. Fry. Home Complete
ff9295fd
509e3373
f91cc7f3
04127b3f
4c0306ba
206d3b76

Market Mesa Complete
3e634cf3
085875b7
8416886a
f760409d
8b7bf4e7
4e06a710

Lava Prairie Complete
5ce181f2
7a4a2f2d
6d5afe81
b6896e5b
14e93798
39cef3ed

Mermaid Coast Complete
4d40bbb4
288a263a
964fd5fd
a75bf36d
c4b48853
a8177c97

Stn Age Spdway Complete
c28a2318
7c3e3d7d
51dcd5ab
c1ae76b9
bedef103
05f73346

Ant Farm Complete
2aa09826
4f2a0115
a1eefe06
2c88c520