On 18 April 2017, Nathan Willett, the frontman of Cold War Kids hinted in an interview, that the band's fourth album is in the works by expressing that he had collaborated with Welch.^[8] The news was confirmed by Welch herself on 27 May 2017, in an interview for The Daily Telegraph.^[9] On 28 February 2018, the band's drummer, Christopher Hayden announced via Instagram that he had parted ways with the band.^[10] In March 2018, the Dutch Record Store Day website revealed that a new single by the band would be released on 12 April 2018, titled "Sky Full of Song".^[11] The listing was later removed.^[11] The single was released on 12 April 2018. The song is accompanied by a video, which was directed by AG Rojas. On 6 April 2018, the BBC announced that the band would headline the BBC Music Biggest Weekend on 26 May 2018, where the band is expected to debut new work.^[12] The band was set to perform worldwide as well, with shows scheduled throughout 2018.

Talking about the title and the themes explored on the album in an interview with Universal Music, Florence Welch said: "There is loneliness in this record, and there's issues, and pain, and things that I struggled with, but the overriding feeling is that I have hope about them, and that's what kinda brought me to this title; I was gonna call it The End of Love, which I actually saw as a positive thing cause it was the end of a needy kind of love, it was the end of a love that comes from a place of lack, it's about a love that's bigger and broader, that takes so much explaining. It could sound a bit negative but I didn't really think of it that way."^[13] Welch is a credited producer for the first time in her discography, as she decided to take charge in making the music, with six months alone spent on demos.^[14]

Welch's lyrics deal with wanting and love, with her describing “Big God” as “obviously, an unfillable hole in the soul, but mainly about someone not replying to my text.” Intimate subjects are discussed, such as "Hunger" referencing an eating disorder in the singer's teenage years,^[14] and "The End of Love" addressing her grandmother's suicide, a topic she has previously explored on the Ceremonials track "Only If for a Night".^[15] Welch also created "Patricia" in dedication to her idol Patti Smith.^[14]

The album title is taken from a poem Welch wrote after wandering through New York City with a friend: “Heady with pagan worship/of water towers/fire escapes, ever reaching/high as hope.”^[14]

High as Hope received positive reviews from music critics upon release, with critics praising Welch's vocals, her themes, and the minimalist production. At Metacritic, which assigns a normalized rating out of 100 to reviews from mainstream publications, the album received an average score of 75, based on 29 reviews, indicating "generally favorable reviews".^[17] Writing for The Daily Telegraph, Neil McCormick gave the album a perfect score, stating that "Welch's singing throughout is extraordinary, shifting gears effortlessly from melancholic softness to high-powered exultation, even ululation. Every gasp, growl and fluttery trill seems perfectly placed."^[20] Roisin O'Connor of The Independent awarded the record a rating of four stars out of five, praising several songs, saying "'Grace' is a moving love letter to her younger sister which asks for forgiveness for her past, chaotic behaviour" and "stirring violins open 'The End of Love' like a sinister eulogy; Welch's voice comes in with gorgeously textured harmonies, unfolding elegantly as she details a finished relationship with bittersweet recollections."^[22]

AllMusic critic Neil Z. Yeung wrote, "Straightforward and relatably human, High as Hope may not be the rousing version of Welch from previous albums, but as a document of her personal growth, it's an endearing and heartfelt study of truth and self-reflection."^[18] Sputnikmusic gave the album a perfect score, writing, "The easiest and most likely path to continued success for Welch and company would have been to attempt to re-create the spellbinding magic of Ceremonials or the anthemic qualities of Lungs. High as Hope is neither, and that makes it hands down the most forward-thinking album of Florence and the Machine's care."^[1]

In a less enthusiastic review, NME gave High as Hope a rating of three stars out of five and called the album "safe", stating "Stripped to the bare bones of her soul and the sentiment, her truth shines – and there's a beauty in that. The only thing holding it back is a lack of risk, but there's still so much comfort in the familiar."^[23] Similarly, Slant Magazine reviewer Josh Goller also gave the album three stars out of five, and said "Welch widens the song's ['Hunger''s] scope from a specific personal battle with an eating disorder to a broader emphasis on universal craving for love and acceptance, but trite statements about the destructive nature of fame and drugs are emblematic of the album's overall tendency to retreat into sweeping, generalized sentiments. Welch strikes a more effective balance between the personal and the universal on 'Big God'."^[28]

High as Hope debuted at number two on the UK Albums Chart, selling 40,304 copies in its first week.^[29] In the United States, the album debuted at number two on the Billboard 200 with 84,000 album-equivalent units, including 74,000 pure album sales, becoming Florence and the Machine's third US top 10 album.^[30] The album was kept out of the top spot in both countries by Drake's Scorpion.^[29] High as Hope has sold 80,700 in the UK as of September 19, 2018.^[31]

Notes

• ^{^[a]} signifies a co-producer.
• ^{^[b]} signifies an additional producer.
• "Big God" contains sampled elements from "Azure Blue" by Simon Benson and Peter Cox.