Haarlem and Keukenhof in one day?

I think it’s doable but the peak time for tulips is in late April. Perhaps there will be some in greenhouses for you to see them in bloom.

You can easily do both.
Visit Keukenhof early in the day, as close to opening as possible. There will be fewer people there early. You will be able to wander more freely. You may go at any pace you prefer and then leave when you have seen enough. From Schiphol take the train directly to Harlem where you will spend however much time you have left.
The gardens are planted so that there are blooms throughout the entire season they are open. In early April, the early varieties of flowers will be blooming. Note, there are more than Tulips planted. Keukenhof is (as far as I am concerned) a must see if you have the opportunity.

Hands down the Keukenhof should be your first priority. It is spectacular. If there is time left, then head for Haarlem.

I've been the first week of April and Keukenhof is stunning. As Mack says they are planted so that there is stuff in bloom the whole time it's open. I'd not hesitate to go then. I'm not a gardener but I was blown away by the colors, textures, designs, wow. Gorgeous.

I'd also not think you can really do both from Amsterdam on the same day. If you do, I'd go to Keukenhof early and try to be there when they open. Then leave at noon and go to Haarlem.

We stayed in Haarlem for the last week of April last year. Obviously we had plenty of time to see the city. The highlight was Keukenhof. Even my husband who isn’t particularly interested in flowers was impressed and enjoyed it very much. I agree with the advice to arrive when they open, spend as much time there as you like, then move on to Haarlem.

There is really nothing unique about Haarlem (15 minutes by train from Amsterdam) compared to Keukenof. You don't have to be super interested in flowers to go to there as it is more about the beauty of the landscape and the themed gallery displays they create from flowers.

Thanks for the quick responses! What is the best way to get to Keukenhof from Amsterdam? There doesn't seem to be a direct route by train.

You will take a train to Schiphol. There you will board a bus that will take you to and from Keukenhof.
https://keukenhof.nl/en/plan-your-visit/
When you return from Keukenhof, board whatever train you prefer to return to the city, or, what my wife and I chose to do was to go directly to Hoorn for a young one, an old one and quite honestly, a few more along with some herring.

There is a shuttle that runs from central Amsterdam and/or outside Schipol airport. The Keukenof website sells a combo ticket for the shuttle round-trip and entrance to Keukenof.

Perfect! Thanks! The combo tickets are available beginning in mid-December. I'm just a little early.

I agree with those who say Keukenhof should be your 1st priority.

Here's the link to Keukenhof if you don't have it already: https://keukenhof.nl/en/plan-your-visit/. It already has extensive information relevant to your visit in April. The FAQ section can answer lots of questions and About Keukenhof at the bottom of the page has some interesting history.

I've been there twice, enjoyed the parade twice and both times it had been too cold for the tulips to be blooming. But the greenhouses had them in abundance and you could see them up close, so be sure to explore them. BTW, there are greenhouses with other flowers, too.

Also be sure to check the weather forecast before you finish your packing and plan to dress accordingly. Both times I was there it was sunny but very cold.

Having said all that, I've also been to Haarlem twice, the last being in 2019. This is a pretty good link of things to do in Haarlem on a day trip from Amsterdam:
https://traveladdicts.net/things-to-do-haarlem-day-trip/. The main things I did and saw in Haarlem are in that list, but I provided direct links below.

The Teylers Museum ("Teylers Museum is the only museum in the Netherlands that has been open to the public continuously since 1784. [It] ... has remained the same since then. ... Teylers can justly lay claim to the title of being the first and oldest museum in the Netherlands.") https://www.teylersmuseum.nl/en.

The Corrie ten Boom House tells "the story of regular Dutch citizens who intervened to save the lives of Jews in danger during World War II. In their unassuming watch shop and home above the store, the Ten Boom family housed Jews and members of the Dutch resistance hiding from the Nazis. ... [You can also] learn about the family’s arrest and imprisonment." https://www.corrietenboom.com/en/home.

The Grote Kerk or St.-Bavokerk. I went there primarily to see the famous 1738 Müller organ, "the most depicted instrument in the world" and lucked into a great concert.

And of course, the Frans Hals Museum which I've also been to twice. https://www.franshalsmuseum.nl/en/.

I found Haarlem to be a charming and easily walkable town. The first time I was there was on a day trip from Leiden. In 2019 I spent 3 nights and 2 relaxing days exploring at my preferred slow pace. I took a bus from Schiphol. If you choose to do a bit of both Keukenhof and Haarlem, your transportation would be only slightly more complicated than going to only one or the other.

Do note that on Mondays most museums are closed in Haarlem, so you may not want to plan to go to Haarlem on that day of the week.

I don't want to put a pin in your balloon, but I think unless you're in your late teens or early 20s, doing the Keukenhof and Haarlem in one day is not a good plan. First of all, you'll spend an hour (each way) getting to and from Lisse and then just walking from the bus stop or parking lot to the center of the park. I live here and when we go, I'm exhausted 3/4 of the way through the park.

I'm feeling your vibe with the sense about the flowers. It's going to be super, super, super crowded a the Keukenhof and it could even be raining or cold that day, much less the cost of the park, transportation and overpriced food and drink. Or you can spend a nice day in a classic European town, (Haarlem), or even go crazy and take the Sprinter to Zandvoort Beach and see the North Sea (15 min away from Haarlem). Or even go to Amsterdam (20 min by train).

I think the K is similar to the Epcot Center when we visited Orlando Florida. Very well planned, pretty and lots of colors, but worth seeing when you have a full day and here for a week or more.

I was in Keukenhof (on the early side) during the first week of April 2018. There were plenty of people there, but it was not mobbed, and I had a wonderful time. I was not exhausted, but I walk a lot. (I was 64 at the time.)

Haarlem is a really nice town, and it has the Corrie Ten Boom museum, which was a must see for me. Be sure to read the book if you decide to go. I would not hesitate to go to Haarlem after Keukenhof if it was the only time I had to do it. Yes, it would be a long day, but soo worth it, at least if you love the story of Corrie Ten Boom as much as I do. Be sure to check and see if you need to reserve in advance. I’m pretty sure we did. It’s very small.

Wow, wow, wow. It can easily be done.
Hm....I did say that you can easily do both and I'm sticking to that. Been there done that and then at the ripe old age of 64. That was our first trip after I recovered from a broken back and a crushed heel (13 titanium screws and 3 metal plates). This is a literal walk in the park.
The transportation is both easy and predictable so coming and going is a piece of cake.
The weather there in the spring can be crappy.... embrace it. It isn't always but I do recall getting rained on late in the day. I was very proud of the umbrella I had along with me. We were happy to duck into a nice restaurant for mustard soup (true), Genever and a few Belgian beers (beware the Dutch stuff, wretched).
The key to making this work is to get to the gardens early. You will have better and less obstructed access and be able to move along at your own pace. As the crowds begin to arrive, you can be heading towards the gate.

Thanks so much for the recent helpful responses! Now that we are getting closer to our trip, we have found more transporttion options available. We did go ahead and book an early shuttle from Amsterdam with entrance to Keukenhof. Then found an easy bus option to Haarlem & will hop on a train back to Amsterdam. We are in our late 60s, but are big walkers & have racked up at least 10 miles in a day on many occasions! Looking forward to getting in as much as we can since I doubt we'll be back.

We too want to go from Amsterdam to Keukenhof at opening in the morning and then to Haarlem. Can you share with me the additional transportation you found from place to place to place? We will be going on May 7, 2024

The Corrie ten Boom house now books up about 6-8 months out. The advice in the RS book is sadly inaccurate, to book ten days out.

We really enjoyed Haarlem, just returned. Perhaps walk down to where the canal cruises are and enjoy the city this way, and rest the feet. The smaller ( about a dozen folks) cruises are nicer and do book up ahead of time. We really enjoyed Haarlem Canal Tours, the captain loved his city and did a great job talking about the history and local culture.

If you get tired, several of the city buses go back to the Haarlem train station.

Enjoy!

We did both and it worked out perfectly! We reserved a spot on the Keukenhof bus that leaves from outside Haarlem train station for the morning. We took the train from Amsterdam Centraal Station to Haarlem (very easy & there are trains every 15 minutes) You can buy round-trip tickets and return on any train you want. We stayed at Keukenhof until around 12:30, then took the return bus to Haarlem, had lunch, took a canal cruise and took in the charming town. We caught a train back at around 6. We were really happy we did it this way. It was one of our favorite days. Enjoy!!

We had lunch in Haarlem at a place called de Volkslust. It was very good!

Thanks for reporting back!