2 January – Major fire at the Fischer casting company in
Alpnach-Dorf (
Obwalden). Damage amounts to 15 million francs[3]
17-19 January – In the context of the International "Year of the Woman", there were demonstrations and the Fourth Congress of Swiss Women held in
Bern[4][5][6]
26 January – Fire at the "Au Grand Passage" store in
Geneva. The establishment is completely destroyed from the second to the sixth floor. Damage estimated near one hundred million francs[7]
26 February – Moritz Suter, former pilot of
Swissair, founds Business Flyers Basel, which will later become
Crossair[12]
March
2 March – Federal votes. The article of the constitution on conjunctural policy is not approved by the cantons (11 against 11), although the people approved it with 542,745 yes (52.8%) against 485,844 no (47.2%)[13]
27 March – Last projection of the Ciné-Journal Suisse in cinemas[17]
April
1 April – 500 anti-nuclear activists invade the site planned for the construction of the nuclear power plant in
Kaiseraugst[18]
5 April – Avalanches block roads and railways in the Alps[19]
6 April – An avalanche carries away a chalet in Val
Blenio. Its five occupants are killed instantly[20]
12 April – At the maternity ward in
Bern, Ruth Winterberger from
Brienz gives birth to quintuplets[21]
20 April
Cantonal elections in
Basel-Landschaft. Clemens Stöckli (
CVP), Theo Meier (
FDP), Paul Manz (
UDC), Paul Jenni (
SPS), and Paul Nyffeler (
FDP) are elected to the
Council of States in the first round of voting[22]
Cantonal elections in
Ticino. Benito Bernasconi (
SPS), Ugo Sadis (
FDP), Argante Righetti (
FDP), Flavio Cotti (
CVP), and Fabio Vassalli (
CVP) are elected to the Council of States in the first round of voting[23]
27 April
Cantonal elections in
Zurich. Jakob Stucki (
UDC), Peter Wiederkehr (
CVP), Hans Künzi (
FDP), Alois Günthard (
UDC), Albert Mossdorf (
FDP), Alfred Gilgen
AdI, and Arthur Bachmann (
SPS) are elected to the Council of States in the first round of voting[24]
22 May –
General Motors announces the closure of its assembly line in
Bienne (
BE) by the end of August. 450 people will lose their jobs[26]
25 May – Inauguration of the
SBB line at Heitersberg, between
Lenzburg and
Zurich. The new route reduces travel time by 10 minutes between
Olten and
Zurich[27]
29 May – Discontinuation of ferry transport for railcars on
Lake Constance[28]
1975 Swiss referendums. The people approve, with 842,165 yes votes (75.6%) against 271,563 no votes (24.4%), the federal decree amending the constitution regarding freedom of establishment and regulation of assistance[31]
Federal referendums. The people approve, with 858,720 yes votes (77.5%) against 249,043 no votes (22.5%), the revision of the constitution in the field of water economy[31]
Federal referendums. The people approve, with 587,148 yes votes (52.0%) against 541,489 no votes (48.0%), the federal law on the import and export of processed agricultural products[31]
2 January – Major fire at the Fischer casting company in
Alpnach-Dorf (
Obwalden). Damage amounts to 15 million francs[3]
17-19 January – In the context of the International "Year of the Woman", there were demonstrations and the Fourth Congress of Swiss Women held in
Bern[4][5][6]
26 January – Fire at the "Au Grand Passage" store in
Geneva. The establishment is completely destroyed from the second to the sixth floor. Damage estimated near one hundred million francs[7]
26 February – Moritz Suter, former pilot of
Swissair, founds Business Flyers Basel, which will later become
Crossair[12]
March
2 March – Federal votes. The article of the constitution on conjunctural policy is not approved by the cantons (11 against 11), although the people approved it with 542,745 yes (52.8%) against 485,844 no (47.2%)[13]
27 March – Last projection of the Ciné-Journal Suisse in cinemas[17]
April
1 April – 500 anti-nuclear activists invade the site planned for the construction of the nuclear power plant in
Kaiseraugst[18]
5 April – Avalanches block roads and railways in the Alps[19]
6 April – An avalanche carries away a chalet in Val
Blenio. Its five occupants are killed instantly[20]
12 April – At the maternity ward in
Bern, Ruth Winterberger from
Brienz gives birth to quintuplets[21]
20 April
Cantonal elections in
Basel-Landschaft. Clemens Stöckli (
CVP), Theo Meier (
FDP), Paul Manz (
UDC), Paul Jenni (
SPS), and Paul Nyffeler (
FDP) are elected to the
Council of States in the first round of voting[22]
Cantonal elections in
Ticino. Benito Bernasconi (
SPS), Ugo Sadis (
FDP), Argante Righetti (
FDP), Flavio Cotti (
CVP), and Fabio Vassalli (
CVP) are elected to the Council of States in the first round of voting[23]
27 April
Cantonal elections in
Zurich. Jakob Stucki (
UDC), Peter Wiederkehr (
CVP), Hans Künzi (
FDP), Alois Günthard (
UDC), Albert Mossdorf (
FDP), Alfred Gilgen
AdI, and Arthur Bachmann (
SPS) are elected to the Council of States in the first round of voting[24]
22 May –
General Motors announces the closure of its assembly line in
Bienne (
BE) by the end of August. 450 people will lose their jobs[26]
25 May – Inauguration of the
SBB line at Heitersberg, between
Lenzburg and
Zurich. The new route reduces travel time by 10 minutes between
Olten and
Zurich[27]
29 May – Discontinuation of ferry transport for railcars on
Lake Constance[28]
1975 Swiss referendums. The people approve, with 842,165 yes votes (75.6%) against 271,563 no votes (24.4%), the federal decree amending the constitution regarding freedom of establishment and regulation of assistance[31]
Federal referendums. The people approve, with 858,720 yes votes (77.5%) against 249,043 no votes (22.5%), the revision of the constitution in the field of water economy[31]
Federal referendums. The people approve, with 587,148 yes votes (52.0%) against 541,489 no votes (48.0%), the federal law on the import and export of processed agricultural products[31]