score:19

Accepted answer

You need to add in a point to you chart but disable the marker. I added a new series with scatter plot type and its value equal to the goal value:

{
     name: 'Goal',
     type: 'scatter',
     marker: {
          enabled: false
     },
     data: [450]
}

See updated jsFiddle: http://jsfiddle.net/wergeld/4R5HH/4/

score:0

You could simply set the max attribute to the max value you will have:

yAxis: {

            max:650 //HERE
            plotLines...

        },

score:2

In some cases, wergeld's solution would be preferable than jank's solution, especially when you are not sure about min and minRange. But wergeld's solution has a minor issue. If you point your mouse over the plot line, it will show a point and tooltip on the point. To avoid this, I have modified his solution and added enableMouseTracking to get rid of the problem. 

{
     name: 'Goal',
     type: 'scatter',
     marker: {
          enabled: false
     },
     data: [450],
     enableMouseTracking: false
}

See updated jsFiddle: http://jsfiddle.net/4R5HH/570/

score:32

One other option that does not introduce data points:

yAxis: {
    minRange:450,
    min:0,
    plotLines:[{
        value:450,
        color: '#ff0000',
        width:2,
        zIndex:4,
        label:{text:'goal'}
    }]
},

This sets the minimum for the yAxis to 0 (this is unlikely to be false in this case) and the minimum Range to 450.

See updated fiddle.


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