Filming dates are fairly accurate this year and often confirmed thru Twitter.
Same goes for the locations. It's easy to assume that sometimes when a location is "unknown" they're likely filming at the studio. ;)
Sources: Spoiler TV, VanCity Filming, andreas_ri, all_spn, & various sources on Twitter.
8x01 -- "We Need To Talk About Kevin" [Directed by Robert Singer] (Filmed from July 19th to July 30th)
[Jul 19th: Studio(?), Jul 20th: UBC, Jul 23rd: unknown, Jul 24th: unknown, Jul 25th: Studio(?), Jul 26th: unknown but on location, Jul 27th: unknown but on location, Jul 30th: unknown]
8x02 -- "What's Up, Tiger Mommy?" [Directed by John Showalter] (Filmed from July 31st to Aug 10th)
[Jul 31st: City Centre Motor Hotel, Aug 1st: unknown but on location, Aug 2nd: 449 Hamilton, Aug 3rd: unknown, Aug 7th: unknown, Aug 8th: Nelson & Kingsway in Burnaby, Aug 9th: unknown, Aug 10th: Purgatory woods in Surrey]
8x03 -- "Heartache" [Directed by Jensen Ackles] (Filmed from July 9th to July 18th)
[Jul 9th: Studio, Jul 10th: Burnaby Fraser Foreshore Park opposite Nokia headquarters, Jul 11th: Squamish(?), Jul 12th: South Langley, Jul 13th: 1419 Pendrell St. & Stanley Park Pavilion, Jul 16th: New Wests's Paramount, Jul 17th: unknown, Jul 18th: unknown]
8x04 -- "Bitten" [Directed by Thomas J. Wright] (Filmed from Aug 13th to Aug 2st) Something wrong here. I've only got 7 days of filming.
[Aug 13th: SFU (downtown Arts) & Catch 122 Cafe, Aug 14th: Off Commercial Drive(?), Aug 15th: Queens Park Field in New West, Aug 16th: unknown, Aug 17th: unknown, Aug 20th: Studio, Aug 21st: New West then Studio(?)]
8x05 -- "Blood Brother" [Directed by Guy Norman Bee] (Filmed from Aug 22nd (confirmed) to Aug 31st (confirmed))
[Aug 22nd: Studio, Aug 23rd: Studio & out on location(?), Aug 24th: unknown, Aug 27th: unknown, Aug 28th: SW Marine Drive, Aug 29th: "In the woods" Purgatory in Surrey(?), Aug 30th: Barnet Marine Park in Burnaby, Aug 31st: 2400 Motel on Kingsway]
8x06 -- "Southern Comfort" [Directed by Tim Andrew] (Filmed from Sept 4th to Sept 13th)
[Sep 4th: unknown, Sep 5th: unknown, Sep 6th: unknown, Sep 7th: unknown, Sep 10th: 509 Agnus St. in New West (Freemason's Hall), Sep 11th: Queens Park & 2nd St. at 3rd Ave in New West, Sep 12th: Behind Queens Motor Hotel in New West, Sep 13th: unknown]
8x07 -- "A Little Slice Of Kevin" [Directed by Charlie Carner] (Filmed on Sept 17th to Sept 26th)
[Sep 17th: unknown, Sep 18th: unknown, Sep 19th: Studio, Sep 20th: unknown, Sep 21st: unknown, Sep 24th: unknown, Sep 25th: unknown, Sep 26th: unknown]
8x08 -- "Hunteri Heroici" "Dean Amuck" [Directed by Paul Edwards] (Filmed from Sept 27th to Oct 9th)
[Sept 27th: Studio, Sept 28th: unknown, Oct 1st: Riverview, Oct 2nd: Riverview, Oct 3rd: unknown, Oct 4th: between W. Pender St. and Dunsmuir St. By Victorian Hotel, Oct 5th: Robson & Seymour, Vancouver // Queen Elizabeth Theatre parking lot @ Cambie & West Georgia // filming in 500 blk Richards downtown tonight. Doing exteriors, Oct 9th: Studio (?)]
8x09 -- "Citizen Fang" [Directed by Nick Copus] (Filmed from Oct 10th to Oct 19th)
[Oct 10th: Studio (?), Oct 11th: on Moncton and 2nd Street & then at Britannia Shipyards (interior & exterior) in Steveston, Oct 12th: Britannia Shipyards (interior) in Steveston, Oct 15th: unknown, Oct 16th: somewhere north on Ladner Trunk Rd., Oct 17th: unknown, Oct 18th: Studio, Oct 19th: New Westminster]
8x10 -- "Torn And Frayed"
[Oct 22nd: College Crescent and 1st Street in New West & then in Studio, Oct 23rd: unknown, Oct 24th: Studio, Oct 25th: unknown, Oct 26th: unknown, Oct 29th: in New West today. 16th street and 11th Ave., Oct 30th: unknown, Oct 31st: unknown]
8x11 -- "Larp And The Real Girl" [Directed by Jeannot Szwarc] (Filmed from Oct 31st(?) to Nov 9th)
[Oct 31st: unknown, Nov 1st: Mundy Park in Coquitlam or Hume Park in New West, Nov 2nd: #BSK signs at 10th Ave and 20th on the New West / Burnaby border, Nov 5th: unknown, Nov 6th: Mundy Park in Coquitlam, Nov 7th: unknown, Nov 8th: unknown, Nov 9th: unknown]
8x12 -- "As Time Goes By"
Cast & Crew get a whole week off for US Thanksgiving (Nov 22nd).
[Nov 13th: unknown, Nov 14th: out on location but unknown, Nov 15th: out in the woods somewhere, Nov 16th: unknown, Nov 26th: Studio, Nov 27th: #Supernatural signs along Terminal. Filming around DT - Gastown (Possibly at The Cambie), Nov 28th: Watchmen Set, Nov 29th: unknown]
8x13 -- "Everyone Hates Hitler" [Directed by Phil Sgriccia] (Filmed from Nov 30th to Dec 11th)
[Nov 30th: Studio, Dec 3rd: unknown, but out on location, Dec 4th: unknown location, Dec 5th: unknown, Dec 6th: Langley, Dec 7th: unknown barn location, Dec 10th: unknown, Dec 11th: Studio (?)]
8x14 -- "Trial And Error"
Cast & Crew get 2 weeks off for Christmas & New Years. Looks like they started early, taking Friday Dec 21st off.
[Dec 12th: somewhere around 2nd Narrows Bridge, Dec 13th: Studio, Dec 14th: Studio (?), Dec 17th: unknown, Dec 18th: unknown, Dec 19th: unknown location w/snow *g* & possibly Studio, Dec 20th: unknown]
8x15 -- "Man's Best Friend With Benefits" [Directed by John Showalter] (Filmed from Jan 8th to Jan 17th)
Jensen & Jared were off Jan. 9th to attend the PCAs, however the crew was still filming in Vancouver.
[Jan 8th: Studio?, Jan 9th: Alley near Century House & in Victory Square, Jan 10th: inside Century House, Jan 11th: filming until early morning Saturday inside downtown Vancouver's Century House, Jan 14th: Studio? or motel location, Jan 15th: Courtney Crescent & Cumberland St in New Westminster, Jan 16th: Studio?, Jan 17th: Studio.]
8x16 -- "Remember The Titans" [Directed by Steve Boyum] (Filmed from Jan 18th to Jan 29th)
[Jan 18th: Fraturday night shoot in woods, Jan 21st: unknown, Jan 22nd, 23rd, & 24th: filming in Vancouver westside warehouse for 3rd & final day (Jan 22-24). All interior, Jan 25th: unknown, Jan 28th: unknown, Jan 29th: unknown]
8x17 -- "Goodbye Stranger" [Directed by Thomas J. Wright] (Filmed from Jan 30th to Feb 8th)
[Jan 30th: unknown, Jan 31st: Fraser Shipyard 61 Duncan St in Queensborough interior & exterior, Feb 1st: 61 Duncan St in Queensborough interior & exterior, Feb 4th: unknown, Feb 5th: "BSK" signs around Planetarium/Kits Beach / 1100 block of Hornby Street opposite the Murray Hotel in downtown, Feb 6th: Studio, Feb 7th: Studio?, Feb 8th: unknown]
8x18 -- "Freaks And Geeks"
[Feb 12th: unknown, Feb 13th: BSK signs at Main Street (Pacific Central), Feb 14th: unknown, Feb 15th: House on Vancouver St in New West, Feb 18th: , Feb 19th: unknown, Feb 20th: unknown, Feb 21st: Studio?]
8x19 -- "Taxi Driver" [Directed by Guy Norman Bee] (Filmed from Feb 22nd to Mar 5th)
[Feb 22nd: unknown, Feb 25th: "Harlem Shake" filmed by cast/crew at crossroads on Back 40 Lot / also filmed inside scenes, Feb 26th: Purgatory Woods (day), Feb 27th: Purgatory Woods (night), Feb 28th: Watchman Backlot at night in heavy rain, Mar 1st: unknown, Mar 4th: unknown, Mar 5th: unknown]
8x20 -- "Pac-Man Fever" [Directed by Robert Singer] (Filmed from Mar 6th to Mar 15th)
[Mar 6th: MOL Bunker entrance under bridge / crew did film scenes on Wednesday night of Dean (Jensen Ackles) and Charlie (Felicia Day) inside the Impala surrounded by food trucks at east Vancouver’s Hastings Community Centre, Mar 7th: unknown, Mar 8th: lighting up the North Vancouver shoreline tonight w/their MASIVE flood lights, Mar 11th: Polka Dot Boutique 626 Columbia Street, New Westminster, BC, Mar 12th: unknown, Mar 13th: unknown, Mar 14th: unknown, Mar 15th: Fraturday (finished at 4 a.m. Sat.) but uknown]
8x21 -- "The Great Escapist" [Directed by Robert Duncan McNeill] (Filmed from Mar 18th to Mar 27th)
[Mar 18th: The Loading Dock, Mar 19th: Studio?, Mar 20th: on location but unknown, Mar 21st: Studio, Mar 22nd: filming at 15th and Arbutus near or inside the Ridge Theatre, Mar 25th: Studio?, Mar 26th: unknown, Mar 27th: filming near Boston Pizza on Marine]
Note: On the weekend of March 23rd & 24th, Phil Scriggia, a splinter crew, the stunt doubles, and a couple of Impalas were out near Kamloops filming scenes for future eps - mostly Season 9.
8x22 -- "Clip Show" [Directed by Thomas J. Wright] (Filmed from Mar 28th to Apr 9th)
[Mar 28th: unknown, Mar 29th: unknown, Apr 1st: unknown, Apr 2nd: unknown, Apr 3rd: at Deep Cove, Apr 4th: Holy Trinity Cathedral 514 Carnarvon Street & on Clarkson St in New West, Apr 5th: unknown, Apr 8th: filming in Coquitlam down near watershed/Edward's house up past the Minnekhada park area (assuming private property), Apr 9th: unknown]
8x23 -- "Sacrifice" [Directed by Philip Sgriccia] (Filmed from Apr 10th to Apr 20th)
[Apr 10th: unknown, Apr 11th: unknown, Apr 12th: in Minnekhada Park, Apr 15th: unknown, Apr 16th: Studio, Apr 17th: unknown, Apr 18th: J2 last day of filming, Apr 19th: unknown, Apr 20th: unknown]
Wrap Party was on April 13th.
If anyone has further info. to share about anything here, I'm always happy to receive it. :)