| Zone 1 Frost Rare | Zone 2 Jan. 21 - Jan. 31 | Zone 3 Feb. 1 - Feb. 10 | Zone 4 Feb. 11 - Feb. 20 | Zone 5 Feb. 21 - Feb. 29 | Zone 6 Mar. 1 - Mar. 10 |
| Zone 7 Mar. 11 - Mar. 20 | Zone 8 Mar. 21 - Mar. 31 | Zone 9 Apr. 1 - Apr. 10 | Zone 10 Apr. 11 - Apr. 20 | Zone 11 Apr. 21 - Apr. 30 | Zone 12 May 1 - May 10 |
| Zone 13 May 11 - May 20 | Zone 14 May 21 - May 31 | Zone 15 Jun. 1 - Jun. 10 | Zone 16 Jun. 11 - Jun. 20 | Zone 17 Jun. 21 - Jun. 30 | Zone 18 Jul. 1 - Jul. 10 |
Plantmaps has derived zones indicating the average annual Last frost dates for Iceland