Wildlife · United States · autumn
Monarch Migration in Pacific Grove
Seasonal monarch butterfly staging and overwintering sanctuaries, tracked from thermal cues and conservation windows.
Readiness
Medium confidence32
Peak in 27 days
Live summary
As of 9 Nov 2026, Monarch Migration readiness in Pacific Grove, United States is 32 out of 100, phase emerging. Accumulated growing degree days since 15 Sept 2026 are 600.1 against a peak threshold of 310.0 at base 5°C. The timing model places peak on 6 Dec 2026. Mean cloud cover over the next three days is 19%.
- Readiness
- 32 / 100
- Status
- Emerging
- Confidence
- Medium confidence
- Evidence type
- Forecast
- Model
- Growing degree days
- Timing
- Peak in 27 days
- Estimated peak window
- 28 Nov 2026 – 14 Dec 2026
- Climatological peak
- 26 Nov 2026
- Adjusted peak
- 6 Dec 2026
- Accumulated GDD
- 600.1 of 310.0
- Planetary K-index
- n/a
- NDVI
- n/a
- Cloud cover, next 3 days
- 19%
- Coordinates
- 36.62° N, 121.92° W
- Updated
- 9 Nov 2026, 08:38 UTC
Warmth moved the peak 10 days later, to 6 Dec 2026.
Fourteen-day outlook
Projected readiness for each day. Botanical and wildlife bars use forecast temperature. Meteor shower bars combine stream activity, lunar phase, and forecast cloud cover. Aurora bars use the NOAA 3-day Kp forecast when available and a quiet-oval baseline with forecast cloud cover for days 4–14.
Mon 9
32 out of 100 on 2026-11-09
56% cld
Tue 10
35 out of 100 on 2026-11-10
1% cld
Wed 11
38 out of 100 on 2026-11-11
0% cld
Thu 12
41 out of 100 on 2026-11-12
32% cld
Fri 13
44 out of 100 on 2026-11-13
59% cld
Sat 14
47 out of 100 on 2026-11-14
92% cld
Sun 15
51 out of 100 on 2026-11-15
95% cld
Mon 16
54 out of 100 on 2026-11-16
93% cld
Tue 17
57 out of 100 on 2026-11-17
38% cld
Wed 18
61 out of 100 on 2026-11-18
1% cld
Thu 19
64 out of 100 on 2026-11-19
9% cld
Fri 20
67 out of 100 on 2026-11-20
12% cld
Sat 21
71 out of 100 on 2026-11-21
65% cld
Sun 22
74 out of 100 on 2026-11-22
80% cld
Field notes & historical context
Western monarchs cluster in sheltered eucalyptus, pine, and cypress groves along the Monterey Peninsula from late October through Winter.
Eastern and western North American monarchs migrate up to 4,500 km as autumn daylength shortens and temperatures cool, clustering on oyamel firs in Michoacán and coastal groves in California.
36.62° N, 121.92° W · America/Los_Angeles
Sources & data freshness
Forecast · Medium confidence · Updated 9 Nov 2026, 08:38 UTC
- Open-Meteo ERA5 & Forecast
Daily max/min temperatures (GDD base 5°C) and 14-day outlook
- CONANP / Xerces Society Monarch Conservation
Sanctuary overwintering windows and conservation monitoring
Safety & responsible visiting
Wild sightings are never guaranteed. Stay strictly on marked sanctuary trails, keep silence near roosting clusters, never use flash photography, and never touch or collect resting butterflies.
Natural phenomena depend on live weather, local access rules, and habitat conditions. Verify local advisories before travelling.
Ground-truth provenance
Community reportField observations for Pacific Grove
Community observations supplement satellite and weather models with eye-level reports. Every submission is tagged as a Community report with provenance and moderation status—never blended silently into automated readiness scores.
No community field reports have been logged for Pacific Grove in this session yet.
Related places
Other seasons in Pacific Grove, and places close enough to plan together.