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The terpene chemistry of a strain often predicts how gracefully it ages under cold — myrcene-heavy cultivars tend to accumulate faster at lower temperatures. Aggregated outdoor grower reports across 47 strains at three Canadian latitudes consistently flag these 10 as finishing with intact trichomes, measurable terpene loads, and zero botrytis before the first frost hits.

Canadian summers are brutally short. Here's two seasons of aggregated Kingston-area outdoor auto data from published grower reports — including the two strains that consistently get caught by September frost and why breeder timelines lie to you.