From the Hertz website. Note the last sentence - for Canada only

Hertz #1 Club Gold President's CircleSM
Terms & Conditions


Qualification
Qualification for the President's Circle is 20+ qualifying rentals within the qualification period. Qualification periods begin on January 1 and run through December 31 of every year. All qualified rentals within that timeframe will be tallied and new membership cards issued the following February. Annual requalification is required.
Guaranteed Upgrades and Availability
Guaranteed one-car-class upgrade or comparable benefits offered only at Hertz participating locations in the US and Canada and select European locations. Maximum upgrade is to a Premium (Class G) car with a minimum reserved Mid-Size Vehicle (Class C). For Compact 4-Door (Class B) rentals, maximum upgrade will be to a Full-Size 4-Door (Class F) car.
Guaranteed Availability of Standard Equipment Vehicles in the U.S. and Canada with a minimum 2 hour advance reservation available at participating locations. Does not apply to coupon offers.
Free Rental Days and Coupon Offers
A Free Rental Day Certificate will be sent out automatically after every 7 qualifying rentals and may be redeemed at participating Hertz locations. #1 Club number must be given at time of reservation. Free Rental Day Certificates can be combined up to 3 days. Free Rental Day Certificates may be used and combined during blackout periods subject to the following minimum rental periods; 2 paid rental days required for 1 free rental day; 4 paid rental days required for 2 free rental days; 6 paid rental days required for 3 free rental days.
Free Day Certificate CANADA Blackout Events: Canada Day, Toronto June 28-June 30, 2001; Civic Holiday, Vancouver, Calgary, Montreal, Toronto, August 2- 4, 2001; Christmas Peak, Vancouver, Calgary, Montreal, Toronto December 20 -26, 2001. U.S. Blackout Events: CES, Las Vegas, NV January 1-10, 2001; President's Week , Reno, NV February 15-18, 2001, All Florida locations February 15-22, 2001; Masters Golf, Atlanta, Atlanta Metro, Augusta, GA and Columbia, SC April 1-5, 2001; Furniture Mart -Spring, Greensboro & Raleigh, NC April 15-20,2001, Charlotte, NC April 13-19,2001; Networld/ Interop, Las Vegas, NV May 5-9,2001; Telecomm Supercomm Atlanta, GA June 3-6,2001; Outdoor Retailers, Salt Lake City, UT August 13-16,2001; Networld/ Interop, Atlanta, GA September 9-12,2001; Furniture Mart -Fall, Greensboro & Raleigh, NC October 14-19,2001, Charlotte, NC October 12-18,2001; Comdex, Las Vegas, NV November 10-13, 2001; Christmas/NewYears, Denver Metro Area December 23-26,2001, Hawaii, December 20-27,2001, Reno, NV, December 20-26,2001, All Florida Locations December 20-28,2001.
Please note that most of the events above will roll over year-to-year.
Coupon offers will be unrestricted as to date of use and may be used during peak periods of demand. Coupon offers are valid on Standard Equipment Vehicles (Classes B,C,D or F) and are subject to vehicle availability. These Offers may not be combined with any other offer or discount.
Bonus Points
The President's Circle 25% bonus Hertz #1 Awards Points will be automatically calculated and credited to your account, if #1 Club Number and code ZE1 are provided at time of reservation, rental or return. The ZE1 code must be used in place of any other frequent traveler program number. Bonus is granted only in Hertz #1 Awards Points and not on frequent traveler miles/credits or hotel points.
All Hertz #1 Awards® Points Terms and Conditions apply.
General
All Hertz #1 Club Gold Membership and Rental Terms and Conditions apply, including the right to change, limit or modify the Hertz #1 Club Gold President's Circle program or portions of the program at any time. The program may be terminated by Hertz upon six months' notice to members.

Above terms and conditions are applicable to resident Canadian #1 Club Gold Members only.