Field dispatch

The Cycle

A House Finch nesting cycle is six phases that line up almost identically every time, and a weather window that doesn’t. This page is the second one — the constant. Stages light up as biology arms them. The daily weather panel grows by one row every twenty-four hours.

The cup is in a wall sconce above the workbench. The cameras have been running since the evening of May 29.

The cycle

Six biological phases. Round two begins at the first. Each block lights up when its trigger fires.

  1. Phase 1

    Nest-building

    May 29 → Jun 1

    Female pressing material into the rim of the wall sconce. Male tracking, courtship-feeding at the cup. Cup read as finished on Day 4 (2026-06-01).

  2. Phase 2

    Laying

    Jun 2 → Jun 6

    First egg confirmed in cup at 09:06 PT 2026-06-02 (Day 5). One egg per morning; clutch complete at 5 eggs on 2026-06-06 (Day 9).

  3. Phase 3

    Incubation

    Jun 7 → Jun 17

    Female-only. Began Day 10 (2026-06-07) on the complete 5-egg clutch — delayed onset for a synchronous hatch. Ran 11 days; the female brooded tight through the final night (Jun 16→17) and the first chick was out by dawn on the 17th — a few days ahead of the marked June 19–21 window.

  4. Phase 4

    Hatching

    Jun 17 → Jun 18

    Began before dawn on Day 20 (2026-06-17). The full five-egg clutch was intact at 01:18 PT; the first hatchling was out by 04:45 PT (four eggs + one chick, confirmed from the top-down camera). The rest of the clutch followed through the day; by Day 21 all five had hatched — a brood of five, confirmed by eye. Synchronous hatch on a 5-egg clutch, a few days ahead of the marked June 19–21 window. (Note: the classifier's wide-frame egg counts undercounted the occluded cup.)

  5. Phase 5

    Brooding → Provisioning

    Jun 19 → Jul 1

    Five eggs hatched Jun 17–18 (Days 20–21). One nestling was lost on Jun 22 — worked out of the cup and ejected from the nest — leaving four; cause undetermined. The four nestlings passed the brooding→provisioning crossover (days 7–9 post-hatch) in the last week of June: the female now broods only intermittently and both adults provision at pace. By Jul 1 (~14 days post-hatch) the chicks are feathered and near-fledging — inside the 11–19-day fledge window. A five-day capture outage (Jun 27–30) fell across this stretch, so the late-brooding data has a gap; footage resumed Jul 1.

  6. Phase 6 · current

    Fledging

    Jul 2 → present

    Underway. As of Jul 2 (~15 days post-hatch) all four nestlings are fully feathered and have branched out of the cup onto the sconce ledge — the last stage before they leave. House Finch young fledge 11–19 days post-hatch (mode 12–15), so this brood's window runs Jun 28 → Jul 6. Exact branching onset is uncertain: the Jun 27–30 capture outage sits inside the window and footage only resumed Jul 1. Fledge itself is the first full daylight with an empty cup — watch the live stream and the Quiet-cup chart; the finale could happen on camera any day now.

Weather, daylight, and the world outside

Every day of the round-two window. Data from Open-Meteo for the sunroom site (37.886°N, -122.118°W). High and low in °C; wind in km/h; precipitation in mm.

DateSunriseSunsetDaylightHighLowWind maxPrecip
Fri May 2905:4820:2214h 33m18.3°12.5°16.2
Sat May 3005:4820:2314h 35m24.0°11.5°15.9
Sun May 3105:4820:2414h 36m28.4°11.2°17.4
Mon Jun 105:4720:2414h 37m31.2°13.5°16.8
Tue Jun 205:4720:2514h 38m25.5°12.4°18.7
Wed Jun 305:4720:2614h 39m28.9°11.9°18.4
Thu Jun 405:4620:2614h 40m28.2°11.9°16.3
Fri Jun 505:4620:2714h 40m29.9°13.6°19.1
Sat Jun 605:4620:2814h 41m22.3°12.3°21.9
Sun Jun 705:4620:2814h 42m25.4°9.5°17.7
Mon Jun 805:4520:2914h 43m23.5°10.8°21.3
Tue Jun 905:4520:2914h 43m24.3°14.6°16.9
Wed Jun 1005:4520:3014h 44m34.0°13.9°16.5
Thu Jun 1105:4520:3014h 45m36.6°18.8°16.5
Fri Jun 1205:4520:3114h 45m34.3°17.7°18.8
Sat Jun 1305:4520:3114h 45m31.6°15.7°20.5
Sun Jun 1405:4520:3114h 46m27.0°13.8°19.3
Mon Jun 1505:4520:3214h 46m26.2°13.4°20.3
Tue Jun 1605:4520:3214h 46m25.2°13.6°21.2
Wed Jun 1705:4520:3214h 47m23.9°14.0°23.6
Thu Jun 1805:4520:3314h 47m22.3°13.5°24.4
Fri Jun 1905:4620:3314h 47m21.2°14.7°23.0
Sat Jun 2005:4620:3314h 47m23.0°15.0°20.9
Sun Jun 2105:4620:3414h 47m26.3°12.8°16.7
Mon Jun 2205:4620:3414h 47m24.0°12.2°18.6
Tue Jun 2305:4720:3414h 47m25.8°12.6°16.7
Wed Jun 2405:4720:3414h 47m23.7°12.1°19.1
Thu Jun 2505:4720:3414h 46m22.8°12.4°21.8
Fri Jun 2605:4820:3414h 46m21.5°11.9°24.4
Sat Jun 2705:4820:3414h 46m21.5°14.4°21.70.7
Sun Jun 2805:4820:3414h 45m27.8°11.0°22.0
Mon Jun 2905:4920:3414h 45m29.1°12.8°21.3
Tue Jun 3005:4920:3414h 45m25.0°13.4°19.9
Wed Jul 105:5020:3414h 44m23.9°12.1°21.0
Thu Jul 205:5020:3414h 43m24.8°13.1°18.4
Fri Jul 305:5120:3414h 43m27.5°12.5°18.2

36 days on the record. Generated Fri Jul 3, 22:00 UTC. Time-series charts will land once the window is long enough to plot honestly.

The plan is for time-series charts — daylight by day, temperature range, wind, precipitation — to land once the window is long enough to draw an honest line. Two data points is a segment, not a trend. Check back as the days accumulate.