日本でクマに遭遇しにくい時期はいつ？
日本への訪問時期は柔軟に調整でき、クマとの遭遇を最小限にしたいと考えています。クマは冬に冬眠することは知っていますが、暖冬などの影響で冬眠しない個体が増えていると読むこともあります。
- どの月に事故（遭遇）が最も少ないですか？
- 冬は本当に安全ですか、それとも冬の目撃が増えていますか？
- 春と秋ではどちらの方がリスクが低いですか？
- 地域によって安全な月は異なりますか？
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Kumamap has 116,565 incidents with timestamps. Monthly breakdown:
- February: 818 (lowest)
- March: 790
- April: 2,580
- May: 8,060
- June: 14,399
- July: 14,263
- August: 10,812
- September: 10,971
- October: 26,277 (highest, 4x any other month)
- November: 16,561
- December: 3,571
- January: 7,471
Feb-Mar is the safest window. Combined: 1,608 out of 116,565 (about 1.4%).
October is the most dangerous by far. Bears enter hyperphagia before hibernation. October 2025 alone saw 88 attacks and 7 deaths.
Spring (Apr-May) has about 10,640 incidents. Autumn (Sep-Nov) has about 53,809. Autumn is 5x more dangerous.
Winter is no longer guaranteed safe. In December 2025, a bear chased a snowboarder at Hakuba47 in Nagano. January still logged 7,471 incidents. Warm winters keep some bears active.
By region: Hokkaido brown bears hibernate later (mid-Dec) and emerge earlier (mid-Mar). Tohoku black bears peak Oct-Nov, worse in acorn failure years.
Recommendation: February-April for bear-minimal hiking.
Seasonal analysis: kumamap.com/en/blog/bears-not-hibernating-2025